Trace Element Certified Marker, Black, Fine Point Tip, 12 Count ORS NASCO Tight tolerances for snug fit Tight tolerances for snug fit on fastener Used wherever powered drive tools are used to install or remove fasteners Designed to withstand the high torque and force associated with impact tools in repetitive application Features two through holes and a groove to accept a Proto Retaining Ring or pin and O ring to help secure the socket to the drive tool anvil Position at appropriate angle to turn fasteners where obstructions prevent a straight application S bond offers excellent stock removal and excellent G ratio Contains trace element certified ink Meets requirements for nuclear energy electronic