Non-slip Handle: Anti-skid design on adjustable dumbbell handles of weight equipment, by increasing the friction with your hands, you will not easily fall off the dumbbells during training. Thickened Locks: Dumbbell bars with locks, locks made of advanced plastic material, , and never rust. Make sure the thickened screw nut and connector are fully tightened before using the dumbbells(4 pcs locks included) Easy Assembly: Standard dumbbell handles smooth screw edges are specially polished, and a pair of dumbbells can be assembled quickly and easy to disassemble with locks and no effort at all. Dimension: 18 inch adjustable dumbbells bars with solid plastic, it's will keep safe while exercise, accommodates weight plates with a 1 inch enter hole. You can use dumbbell bars with different weight to built muscle,engage upper body muscles including chest, back, biceps, triceps, traps and core. Color: black + red Material: PVC+Steel Package Contents: 2 x dumbbells connectors 4 x nuts Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.