Description: Secure Spinlock Collars: Our dumbbell bars with threaded ends and star-lock collars provide a secure workout and an easy weight plate changes the full set of 2 dumbbells. Our adjustable dumbbell set comes with 16 weight plates in 4 different weights (5.5 lbs, 4.4 lbs, 3.3 lbs, 2.8 lbs), 4 pieces for each weight, and two 18.5 x 1" iron bars with a 5.4" long handle for each bar. Two Star-lock Collars Nonslip Knurled Handles: This dumbbell set features a hard plastic handle with a diamond knurled texture on each bar to increase friction, ensuring the safety of your every workout protective. Weight plates are covered with plastic to avoid causing damage to the floor, suitable for home use, and easy to use. Compact dumbbells are easily assembled within seconds. The customizable design cuts the need for multiple dumbbells in your home gym adjustable weight.