Norseman by Viking Drill and Tool (1 per pack) 1-5/8" x 1" , 3/8" shank, Deep Carbide Tip Holecutter Boring Bit. Premium Carbide Tipped Hole cutters 3-Flats on Shank Cut up to 1-inch-inch Thick Material. Cuts up to 1" material. 3 flatted for keyless chucks. Produces holes 3X faster thank bi-metal hole saws. (64160)