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- Mirafit Cast Iron Dumbbell Set
- Choice of total weight (total weight includes plates, bars and collar weight)
- Adjustable spinlock dumbbells are ideal for home use - simply add and remove weight discs as required
- Sets include two dumbbell bars, four collars and collar tool
- Weight plates included with each set are listed at the bottom of this page
- Additional weight discs are also available (each dumbbell has enough room to reach 50kg total weight per hand)
- Comfortable 28mm diameter provides a superior feel in the hand compared to standard bars
- Please note standard 25mm and Olympic 50mm weight plates will not fit these bars
- Ideal setup to gradually increase your strength training
- Increase muscle mass with high weight and low reps
- Increase muscle endurance with low weight and high reps
- Collars have built in hex bolt which tightens to prevent loosening during use (hex tool included)
- Spray finish on plates will show small marks on arrival. This is to be expected so please consider this before purchase
- Optional bar joiner also available which converts the dumbbell bars into a single straight barbell, allowing additional exercises to be performed
- Measurements:
-
2.5kg Plate
- Diameter: 16.8cm
- Width: 2cm
- Centre Diameter: 2.9cm
-
5kg Plate
- Diameter: 23cm
- Width: 2cm
- Centre Diameter: 2.9cm
-
Dumbbell Bar
- Total Length: 42.5cm
- Grip Length: 11.5cm
- Sleeve Length: 14cm
- Sleeve Diameter: 2.8cm
-
Bar Joiner
- Total Length: 30cm
- Internal Diameter: 2.8cm
-
Weight Sets
- 20kg set includes 4 x 1.5kg and 4 x 2.5kg plates
- 30kg set includes 4 x 1.5kg and 8 x 2.5kg plates
- 40kg set includes 4 x 1.5kg, 4 x 2.5kg and 4 x 5kg plates
- 50kg set includes 4 x 1.5kg, 8 x 2.5kg and 4 x 5kg plates
- 60kg set includes 4 x 1.5kg, 4 x 2.5kg and 8 x 5kg plates
- 70kg set includes 4 x 1.5kg, 8 x 2.5kg and 8 x 5kg plates
- 80kg set includes 4 x 1.5kg, 4 x 2.5kg and 12 x 5kg plates
- 90kg set includes 4 x 1.5kg, 8 x 2.5kg and 12 x 5kg plates
- 100kg set would require purchasing the 20kg set + 16 x 5kg plates
Mirafit Cast Iron Adjustable Dumbbells
Our Cast Iron Dumbbell Sets are ideal for training at home and are available in a range of weights. The spinlock bars include secure collars with tool and additional plates are available allowing you to add extra weight to suit your level.
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UK Delivery £4.99
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Money back guarantee
We offer an industry-leading 30-day money back guarantee on all unused Mirafit products.
Frequently Asked Questions
Mirafit Cast Iron Adjustable Dumbbells are plate-loaded dumbbells that allow you to add or remove weight plates to suit different exercises and strength levels, making them a versatile option for home gyms.
These adjustable dumbbells are available in a range of set sizes, from lighter beginner-friendly options to heavy-duty sets for experienced lifters, sets range from 20kg (2 x 10kg) up to 90kg (2 x 45kg) total.
Yes, these dumbbells are typically sold as a pair and include handles, spinlock collars and weight plates depending on the set selected.
Yes, they are suitable for beginners because you can start with lighter weights and gradually increase the load as you get stronger.
You can use them for a wide range of exercises including bicep curls, shoulder press, chest press, goblet squats, lunges, rows, deadlifts and many more.
Yes, cast iron adjustable dumbbells are excellent for progressive overload, which is key for building muscle and increasing strength.
Yes, they are made from robust cast iron with chrome handles and knurled grips for durability and secure handling.
Yes, the included spinlock collars help keep the plates securely in place during use.
The weight can be changed by removing the collars and adding or removing plates.
Adjustable dumbbells are more space-saving and cost-effective than buying multiple pairs of fixed dumbbells, though they can take longer to adjust between exercises.
Because one set replaces multiple pairs of dumbbells, they are ideal for small home gyms, garage gyms and spare rooms.
Yes, additional compatible weight plates can be purchased separately to increase the maximum load over time.
Yes, the knurled chrome handles are designed to provide a secure and comfortable grip during lifts.
As with most plate-loaded dumbbells, there may be some movement or noise from the plates during dynamic exercises, but properly tightened collars reduce this.
Yes, they are often recommended as a robust and cost-effective alternative to expensive selectorised adjustable dumbbells or multiple pairs of fixed dumbbells, especially for home strength training.
Reviews
(4.6) Based on 45 reviews
- 5 star reviews
- 78% (35)
- 4 star reviews
- 11% (5)
- 3 star reviews
- 7% (3)
- 2 star reviews
- 4% (2)
- 1 star reviews
- 0% (0)
Share your thoughts
If you've used this product, share your thoughts with other customers
Write a reviewSimon
Sep 21, 2026
Competitively priced compared to other dumbells on the market. Quick and easy to adjust weight and collars firmly hold weights in place. Good value for money
Andrew
Jul 6, 2026
Decent enough dumbbells, no real complaints except the rubber ring in the collars keeps coming off. Whatever adhesive is used isn't strong enough so I find myself having to re-tighten the collars after each set and thumbing the ring back in when adjusting the plates. Pretty annoying.
Additionally the coating on the plates is flaking off, not too fussed about that though since it's just superficial.
Andy
Jun 9, 2026
Very good products as advertised and competitively priced will purchase more in the future
El Tobo
May 9, 2026
These are great, highly reccommended. Weights are easy to change, bars grip well and feel solid, threads work beautifully on the collars, feel very safe.
I'd say its hard to do better!
Tomi
Mar 6, 2026
If you manage to get a good pair of bars, it's a great product for the price. I got one set with weights and it's good. I also got a second pair of bars and collars, but the bars were poor quality. I got two replacements, and they were all the same - but in different ways. The main issues were so poor threads in some that the collar couldn't get through, and weight plates not sitting straight. Overall, they're not precisely machined products and they don't need to be, but these were unacceptable. Hopefully this is just one batch as almost all comments are positive. The upside is that customer service has been very responsive and helpful with the issues.
Elliot
Feb 25, 2026
Good Quality Dumbbells, for a good price.
Can fit a good amount of weight on them, going up to around 55kg on just one Dumbbell.
Dan
Sep 28, 2025
I've been using these regularly for over a year. They are comfortable, hyper secure and can be loaded high while being compact for effective range of motion which is essential as you get stronger. The weights are also high quality - I have dropped them from hip height many times (onto a safe mat) during failed reps without issue and the paint job is very good.
One point to note: while an advantage of these is that they have 28mm handles, which are more ergonomic, it means the weights are hard to match with a future barbell purchase which tend to be 25mm or 50mm sleeves. If you plan on building economically into a full gym with an eye to long-term (years) progression, this is worth bearing in mind. However, this can be overcome and depends on training goals (and how important specialist dumbbell work is to you) as olympic style dumbbells are not as good as these anyway.
Wesley
Sep 21, 2025
Ordered these dumbells to start a home workout as well as my PT session and couldnt be happier. Quick delivery and good quality and brilliant for home use
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