Steel Dragon Tools 13pc. HSS Annular Cutter Kit 7/16" to 1-1/16" with 1" Depth and 3/4" Weldon Shank Kit includes 11 high-speed steel annular cutters and two (2) pilot pins. Bit sizes included: 7/16 in., 1/2 in., 9/16 in., 5/8 in., 11/16 in., 3/4 in., 13/16 in., 7/8 in., 15 Cutting Depth: 1 in. 3/4 in. Weldon Shank Large holes can be drilled up to ten times faster than regular drills bits