Description Material: HSS 4241 Drill Bit Black Chamfer Drill Bit Body Material: 45 Steel Color: As Shown. Size (matching size): 6: 3mm 10: 3.5mm 13: 4mm 16: 4.5mm Shank: 2.5mm diameter hex shank Features: Quality product, sharp and durable. Set of 4 bits for drilling holes for screw sizes 6, 10, 13, 16 with mini hex key. It can drill holes for screws and hold them on the same axis, after tightening the screws, the nuts under the plate. Apply with pliers or a combination drill, suitable for drilling holes in parquet and parquet, machine screws for screws wood. Function: After screwing the nut under the plate, the screw hole can be drilled and held on the same axis. High Quality: Compared with ordinary drill bits, our drill bits are titanium plated, which is harder and more durable. Each cutter is made from heat-treated steel with easily replaceable HSS (High Speed Steel) bits for long-lasting, repeatable performance. Excellent design: 4-piece set includes a set of drill bits for drilling pilot holes for screws size 6, 10, 13, 16. The uniquely designed countersunk head steel pilot hole can install the appropriate size socket on the screw head and fix it with a hex key for easy replacement and adjustment. Quick change: the depth adjustable inverted sleeve allows you to drill and countersink wood screws without changing the bit. The length of the bit can be adjusted for different screw lengths by simply loosening and tightening the grub screws. Wide use: ideal for plastic, wood and metal, ideal for home DIY and general construction/engineering. Meanwhile, Christmas gifts for Dad/Father, Husband, Boyfriend, Man, DIYer. Hint: Colors may vary slightly due to lighting or of the brightness of the monitor. Due to manual measurements, the dimensions shown may vary by 0-3mm, it is completely normal. The items are very sharp , keep away from children. The actual color may differ from the picture, depending on your computer display and light settings. Thanks