ITEM NAME:6pcs Countersink Bore Set Round Shank Chamfer Drill Bit 6/8/10/12/16/19mm Description: Suitable for hardness lower material, such as wood For use with Cordless drills , regular drills, drill presses, or low rpm rotary tools. Great for making countersink holes for counter sunken screw heads as well as counterbored holes for plugs. Shank: Hex Shank Material: High Carbon Steel Surface treatment: Titanium Quantiy: 1 Set of 6 Pieces 6mm, 8mm, 10mm, 12mm, 16mm, 19mm Size: Approx. 80*55*19mm/3.15*2.17*0.75'' Package Includes: 6 Pieces Countersink bits Note: As different computers display colors differently, the color of the actual item may vary slightly from the above images. There is 2-3% difference according to manual measurement. Please check the measurement chart carefully before you buy the item..Great for making countersink holes for counter sunken screw heads as well as counterbored holes for plugs. 6 Pieces Countersink bits. Quantiy: 1 Set of 6 Pieces 6mm, 8mm, 10mm, 12mm, 16mm, 19mm. Shank: Hex Shank.