Non- 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 Safety Locks: Dumbbell bars with locks, locks made of advanced plastic material, durable, 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.