MK Morse carbide tipped hole cutter. Carbide tipped cutting edge each tooth is specifically ground to create an accurate, burr free hole. Beveled gullet design ground gullets allow chips to clear cut easily for faster cutting. Ejector spring, easier slug removal. Step center pilot drill controlled drilling to reduce breakthrough impact, preventing carbide tooth damage and increasing cutting life, easily replaced. Step shoulder prevents hole cutter pass through and controls depth of cut. Three side flat arbor Improves chucking strength.