Lenox Tools 2010534CHC 34 Carbide Tipped Hole Cutter, 2-1/8-Inch or 54mm Hole cutter features precision-ground carbide teeth for fast cutting of clean, round holes Carbide hole cutter has an over-drill stopper to prevent penetration beyond the hole Hole-cutting saw starts on contact Split-point pilot bit gives fast penetration with less walking Use the hole cutter with a 3L or 6L standard arbor