Standard headless liner bushings are used with standard SpeedLoc locators to protect the integrity of precision locating holes on bases, fixture plates, indexers and other workholding devices. They are a critical component for creating the highest possible machining accuracy and extending the life of the SpeedLoc System. For most applications, only two bushings should be used to avoid binding and alignment issues. Made from AISI-1144 alloy steel. Hardened to Rc 62-64.