GREENLEE 645-4-1/8 4-1/8" Quick-Change Carbide-Tipped Hole Cutter

4-1/8" Quick-Change Carbide-Tipped Hole Cutter. Switch quickly between cutting head sizes without re-chucking with a simple push and turn connection. Split-Point Cobalt Steel Pilot Drill with step design for fast, accurate cutting with less force. Tungsten Carbide Teeth optimized design for fast, easy cutting and maximum life in stainless steel, no oil required. Flange Stop eliminates over-drilling. Slug Ejector Spring quick, easy slug removal. Cuts round, burr-free holes