Robert Baraban Deluxe Chrome Adjustable Hand Gripper 50/500lbs Resistance with Natural Wood Storage Box Chrome plated adjustable hand gripper from Robert Baraban. Over 50 adjustments that range from easier than a RB70 gripper to harder than a RB400 Two springs of differing tension allow you to choose resistance levels from 50 to 500lbs. Solid steel and built to last. Natural wood storage box. Extension handle for negative rep training; close with two hands, resist with one.