Feature:1. Provides comfortable grip, and simply slides in and out of the weight bar.2. The unique protective chrome surface and double ring steel design can fix the bumper in place.3. Does not slip during exercise. Very suitable for home exercise, push-ups, fitness, benching.4. Simple and effective, ensuring that the bumper and the plate are kept in the proper position on the barbell, with strong grip.5. Hard to rust, durable, easy to assemble and disassemble, easy to exercise.Specification:Condition: 100% Brand NewItem Type: Dumbbell Spring LockMaterial: Metal plating + plastic handleColor: As picture shownHandle length: Approx. 40mm/1.6inOptional Size(inner diameter): Approx. 28mm/1.1in, 30mm/1.2in, 50mm/2in28mm and 30mm type length: Approx. 85mm/3.3in50mm type length: Approx. 115mm/4.5in.Package List:4 xDumbbell Spring Lock