Lenox 4-1/4 in. Hole Saw Pilot Drill Bit, 3/8 in. Shank. The LENOX Hole Saw Pilot Drills Feature A Quick Change Groove Compatible With Both LENOX SNAP-BACK Quick Change Arbors And Traditional Non-Quick Change Arbors (Excluding Proprietary Arbor Systems Not Using Standard 1/4-In Shank Pilot Drills ). The High Speed Steel Construction Is Optimized For Drilling Wood And Metal.