Captains Of Crush Hand Grippers GripBoard The GripBoard
May 22, 2009· The main difference is that the spring in Tetting grippers (either BeefBuilders or T1T6 variations) are set in the handles with a pin instead of glue. Though I've never had a problem with COC grippers, I have expereinced glued springs working their way out of the handle. Secondarly, Tetting grippers have a tougher knurling than the COCs.