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Description: 3pcs Single Flute 90 Degree Edge Chamfer 3/8 1/2 3/4 Inch Countersink Drill Bit Specification: Material: High Carbon Steel (suitable for low hardness of the workpiece, such as wood) Surface Treatment: Titanium Coated Type: single Flute 90 Degree Color: Golden Weight: 80G Quantity: 3pcs Scope: Mechanical workpiece , Aviation, War industry, Electric valve, Cylinder, sphere hole, ect. Features: Chamfer Shank Diameter Head diameter Suitable Hole SIze 3/8" 6.35mm 9.53mm 2~5mm 1/2" 6.35mm 12.7mm 5~9mm 3/4" 6.35mm 19mm 8~13mm Package included: 1x 3/8" Drill Bit 1x 1/2" Drill Bit 1x 3/4" Drill Bit