ADJUSTABLE Simply rotate the handle left or right while positioned on the tray to adjust the weight from 5 to 25 pounds in 5 pound increments. No knobs to turn, pins to align, or levers to slide just twist and go! US Patent 11,285,354 EFFICIENT Quickly switch weights between exercises during circuit workouts & lower the downtime between exercises; Storage tray securely stores the adjustable dumbbell no rolling, tripping over weights or long downtime; Tray included to safely store dumbbells VERSATILE The ADJUSTABELL weight adjustment system allows you to rapidly switch from one exercise to the next; Easily switch heavy weights for squats and lunges to lighter weights for curls and triceps extensions. FUNCTIONAL The unique dial system combines 10 SETS of weights into ONE; Handles have a chrome finished, contoured, natural orientation for a comfortable, secure lifting position. Honeycomb design prevents dumbbell from rolling away between sets SPACE-EFFICIENT