Description: 4pcs Woodworking Countersunk Head Drill Bit. Material: High speed steel. Heat treated carbon steel for strength,Suitable for all hand and power drills. Contains four popular sizes of countersink bits :6mm, 8mm, 10mm, 12mm. Handle: Hexagonal Shank ,Do not use the product for metalworking. Specification: Material: HSS Color: As picture show Package Includes: 1 Set Woodworking Chamfer Tool Kit Set (4 Pieces) Note: Since the size above is measured by hand, the size of the actual item you received could be slightly different from the size above