GD Iron Grip Adjustable Hand Gripper, EXT 90 Wrist Exerciser Hand Strengtheners Hand Strength Training Equipment. Able To Adjust Weight, Wide, Adjustable Resistance Range From 25~90kg (55.11~198.42 lbs), Simple and Easy Adjust. Stage 1. 55lb (25kg) Stage 2. 84lb (38kg) Stage 3. 112lb (51kg) Stage 4. 141lb (64kg) Stage 5. 170lb (77kg) Stage 6. 198lb (90kg). Good Design & Simple Structure, Comfortable Gripping, Able To Extend the Length of the Handles with the Included Add-On Parts For Large Hand. Manufactured Completely from Metal Parts for Durability