These tapped Round Grippers can be fastened from behind with a socket-head cap screw, or clamped with a setscrew on the O.D. locking flat (1/4"-diameter grippers do not have a locking flat). Grippers can be recess-mounted in a flat-bottom hole, or surface mounted to use as a rest pad. When grippers are installed in a hole, they should project 50 to 100% of serration height for maximum effectiveness (serration height is .047" on grippers with .094" x 90° serrations, .062" on grippers with .125" x 90° serrations). Tapped Round Grippers can also be installed in Gripper Swivel Pads and Gripper Swivel Contact Bolts.