Product details:
Norseman CHD-AG Deephole Carbide Tipped Holecutter, 2-1/4" Diameter, 3/8'' Shank The built–in pilot drill with ejector spring quickly discharges the slug effortlessly. Easily produce overlapping and interrupted holes. Cuts 3 times faster than bi-metal hole saws. 3-flatted shank for keyless chucks.