1/2" Shank Fly Cutter Set 3/4'' For 1-1/2'' Milling Hardened Tool Tips A fly cutter is composed of a body into which one or two tool bits are inserted. As the entire unit rotates, the tool bits take broad, shallow facing cuts. Fly cutters are analogous to face mills in that their purpose is face milling and their individual cutters are replaceable. fly cutter set that-Inch's hard to beat. each is supplied with black oxide finish a setscrew flat Cut flat surfaces in a path up to 4” wide with these counterbalanced cutters. Cutter heads are hardened steel with 1/2” shanks. Includes body sizes 1-1/16”, 1” and 1-3/8” plus tool bits. Uses unsharpened HSS bits, 3/16", 1/4", and 5/16". HSS BITS