We Also Have Various Other Models Of Cnc Turning Tools And Accessories. If You Need It, Please Contact Us.Only Personnel With Professional Skills Are Allowed To Use It. Please Wear Safety Helmets, Goggles And Other Safety Equipment When Using.Features:1. This is the New HSS Steel Large Step Cone Drill Cobalt Bit Set Hole Cutter.2. which is made from high quality HSS steel, and with the Titanium coated to reduce friction and heat.3. It is very suitable for using to cut holes in a variety of materials including steel, brass, wood, plastic, etc.Specification: Type: Core Drill BitMaterail: HSS High Speed Steel Coated: Cobalt Size x Total Length x Shank Dia x Shank Length3/16-1/2 x Approx 57mm x Approx 6mm x Approx 24mm 1/8-1/2 x Approx 77mm x Approx 6mm x Approx 24mm 1/4-3/4 x Approx 73mm x Approx 9mm x Approx 24mm3/16-7/8 x Approx 77mm x Approx 9mm x Approx 24mm1/4- 1-3/8 x Approx 76mm x Approx 9mm x Approx 24mmSize Including: 3/16-1/2: 3/16'', 1/4'', 5/16'', 3/8'', 7/16'', 1/2''1/8-1/2: 1/8'', 5/32'', 3/16'', 7/32'', 1/4'', 9/32'', 5/16'', 11/32'', 3/8'', 13/32'', 7/16'', 15/32'', 1/2''1/4-3/4: 1/4'', 5/16'', 3/8'', 7/16'', 1/2'', 9/16'', 5/8'', 11/16'', 3/4''3/16-7/8: 3/16'', 1/4'', 5/16'', 3/8'', 7/16'', 1/2'', 9/16'', 5/8'', 11/16'', 3/4'', 13/16'', 7/8''1/4- 1-3/8: 1/4'', 3/8'', 1/2'', 5/8'', 3/4'', 7/8'', 1'', 1-1/8'', 1-1/4'', 1-3/8''Package Including:1Set Step Drill Bit