LENOX CARBIDE HOLE CUTTERS LENOX Accurate, burr-free holes. Precision ground carbide teeth for fast cutting of clean, round holes. WILL NOT DAMAGE WORK. Over-drill stopper prevents the tool from penetrating beyond the hole. Starts on contact. Split point pilot bit for faster penetration and less walking. Desc.: 3L, 1/2" arbor for 20CHC-48CHC. Solid hex shank