a6ecaca2_per_Guide___Ground_Up_Strength__Notes
[Gripper Type] #3.5 [Resistance (lbs)] 322.5 [Notes] 
If you're going to close the No.4, you're going to need all the help you can get. The progression from a 3 to a 4 is the highest (85lbs).
The Gripper Guide - Ground Up Strength
Notes