# BRAINGAIN Adjustable Kettlebell 18kg 7-in-1 with Quick-Lock Mechanism, Cast Iron

Source: https://www.ranked10.co.uk/fitness/best-adjustable-kettlebell/braingain-4-18kg
Ranked #2 in "Best Adjustable Kettlebell 2026: What 7-in-1 Really Means": https://www.ranked10.co.uk/fitness/best-adjustable-kettlebell

- Price: £99.99 (checked on Amazon UK on 2026-09-12)
- Amazon rating: 4.5 from 40 ratings
- Buy on Amazon: https://www.amazon.co.uk/dp/B08ZYW7KCH?tag=ranked10-21

BRAINGAIN's 7-in-1 costs £99.99 and is the only adjustable kettlebell in this comparison with a stated warranty: two years, from a UK brand.

It adjusts from 4kg to 18kg in seven steps, which is a real increment of about 2.33kg per step.

## Specification

| Field | Value |
|---|---|
| Range as stated | 4kg to 18kg |
| Increment | About 2.33kg |
| Warranty | 2 years, UK |
| Weight at the top | 18kg |
| Ratings | 4.5 from 40 |
| Handle diameter as listed | Less than 27.27 inches |

## Questions people ask

**What does it weigh when empty?**

4kg, which the listing states as the starting weight of the adjustment range.

**What is the step size?**

About 2.33kg. Seven weights across a 14kg range, and the increment is never stated as a number.

**Who makes it?**

BRAINGAIN, a UK brand that names itself in the listing and offers a two-year warranty.

**Is the handle the width stated?**

No. The field reads 27.27 inches, a double unit conversion; a kettlebell handle is 3 to 4cm.

**Why is it second rather than first?**

The warranty is the best here and it costs £60 less than the pick, but 40 ratings against 71 makes it the thinner evidence.

**How many ratings does it have?**

40 at the time of collection, averaging 4.5 stars, with 76 per cent five-star and 6 per cent one-star.