Specification: Drill Bit Size: 3mm, 4mm, 5mm, 6mm Shank Diameter: 3mm / 0.12", 4mm / 0.16", 5mm / 0.2", 6mm / 0.24" Total Size: 15x60mm / 0.59"x2.36", 15x76mm / 0.59"x3", 16x85mm / 0.63"x3.35", 16x93mm / 0.63"x3.66" Drill Bit Size: 3mm, 4mm, 5mm, 6mm, 7mm, 8mm,10mm Shank Diameter: 3mm / 0.12", 4mm / 0.16", 5mm / 0.2", 6mm / 0.24", 7mm / 0.28", 8mm / 0.31", 10mm / 0.39" Total Size: 15x61mm / 0.59"x2.4", 15x74.5mm / 0.59"x2.93", 15x86mm / 0.59"x3.39", 15x93mm / 0.59"x3.66", 15x100mm /0.59"x3.94", 15x110mm / 0.59"x 4.33",18x121mm / 0.71"x4.76" Material: HSS (High-Speed Steel) Package Content: 1 x Countersink Drill Bit Set   Description: 【Simple Use】In one step, you can drill, countersink and counter bore the pilot holes. Drill bits sizes: 3mm, 4mm, 5mm, 6mm. 【Unique Design】Three-Pointed design can quickly and accurately drill a smooth hole. Five-edged chamfer design will fast discharge chips from the hole on both sides automatically. 【User-friendly Design】Use the hex key to remove five-bevel chamfer or adjust counter sleeve depth and drill depth for screws of various lengths. 【Extremely Versatile】The Countersink Drill Bit Set is includes 1 piece of hex key and 4 pieces of countersink drill bit in 4 different sizes to satisfy all you demand. 【Multipurpose】Perfect for Granite, tile, glass, ceramic, vitrified brick etc. Suitable for bench drill, hand drill and conventional electric drill.