IVY Classic 27000 3-Piece Bi-Metal Lock Installation Kit For Steel and Wood Doors, One Piece Arbor Attached Hole Saw, Carded For installing 2-1/8-inch locksets and deadbolts with 1-inch latch holes on steel and wooden doors Bi-Metal construction with M-3 cutting edge cuts metal and wood, Cobalt Advantedge (Registered Trademark) Variable pitch, positive rake tooth design 4-6 TPI minimizes tooth wear Solid alloy-steel back reduces vibration and convenient, one-piece hole saws save arbor changes. Set contains 1-inch and 2-1/8-inch one piece arbor attached bi-metal hole saws and 1/4-inch HSS pilot bit