Dumbbell Converter-Convert Dumbbells to Barbell Set and Kettlebell for Home Fitness-Adjustable & Up to 200 lb Capacity Weight Ba

Useful adapter. i've used it a few times already and it's holding well. simple locking mechanism. comes with a manual that says the weight limit is 40kg.

Looks sturdy enough to hold heavy weights and a great locking system so it wont fall or twist during use. Only reason its 4 stars is because it doesnt fit the specific dumbells i have at home (clamp too narrow), i dont have a common design though (some cool modular dumbells, the handle seems to be a bit narrower width wise and thicker circumference wise), would probably fit ur average dumbell including heavier weights, i just got unlucky