Features: Conventional round shank designed for more extensive use. Long service life for wood working wood hole saw woodworking tool for hinge window lock. Wear resistant carbon steel keep cutting smooth for extended lifespans. Both pilot drill and counterbore depth are adjustable, to achieve accurate drilling. The added frictionless depth control collar can reduce surfaces marring effectively. Our countersink drill bit can quickly discharge the debris in the hole, effectively preventing the accumulation of retained debris and improve drilling efficiency. Specifications: Material:Carbon Steel Shank Diameter: 8mm Length:Approx.9cm/3.54'' Package Includes: 1Piece Countersink Drill Bit note: Please allow 1mm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color of the item.