A mandrel with a standard SDS plus Shank. The grooves in the Shank eliminate slipping. Only for use with SDS drills. Model SD3 Arbor with 1/4 in. Pilot Drill. Also has two driving pins to spread the load. SDS driving Shank. For use with holesaw sizes from 1 1/4 in. to 6 in. (32 to 152 mm.).