Sure Grip BushingsSure-Grip "Quick Detachable" (QD) bushings are easy to install and remove. They are split through flange and taper to provide a true clamp on the shaft that is the equivalent of a shrink fit. All sizes except JA and QT have a set screw over the key to help maintain the bushings position on the shaft until the cap screws are securely tightened. Versatile Sure-Grip bushings permit the mounting of the same mating part on shafts of different diameters, and the mounting of different sheaves on the same shaft using the same bushing.