ITEM NAME:4pcs Conical Hex Shank Countersink Drill Woodworking Drill Bit Drilling Set #gib Product Description Description: Features: It can drill the screw hole and the sinking hole for the screw cap at the same time and keep them on the same axis. After the screw is screwed, the screw cap is located below the plane of the plate. Usage: Suitable for drilling machine with chuck or joint, suitable for drilling on hard wood and wood layer. Specifications: Material: Drill bit (conical core):HSS4241 Black chamfer: Carbon steel Model: 4pcs tapered countersunk bit drill Handle: 1/4 hexagonal handle Size of countersunk bit Correspond diameter of bit (core) 6# 3mm 10# 3.5mm 13# 4mm 16# 4.5mm Packaging size: 100*70*30mm/3.94*2.76*1.18" Notes: 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! 2. Please allow slight measuring deviation due to manual measurement. Included: 1 X Drill Bit Set.Black chamfer: Carbon steel. After the screw is screwed, the screw cap is located below the plane of the plate. Model: 4pcs tapered countersunk bit drill. Drill bit (conical core):HSS4241. Usage: Suitable for drilling machine with chuck or joint, suitable for drilling on hard wood and wood layer.