sizes in one drill set (3mm/4mm/5mm/6mm/7mm/8mm/10mm) to meet your needs perfectly. High speed steel is quenched, high hardness, good wear resistance, high heat resistance and high strength, durable. . Spiral wood bits can be used for thin metals such as steel and aluminum, especially plastics or wood. The length of the bit can be adjusted for screws of different lengths by simply loosening and tightening the set screws. Suitable for steel, aluminum and other metals, wood and plastic Wood cutter sleeve depth adjustable with wrench. Woodworking to remove and chamfer the removable parts. Does 5 flutes allow the wood to be unloaded faster in the process of using, one-way drilled sink hole, stopper screw perfectly integrated into the surface of the workpiece. The milling drill features large chip flutes and a five-edge beveling machine to quickly remove sawdust for a smooth finish on any hardwood, cork, or aluminum. When using, you can unload the wood, and the hole sinks faster flat once. The drill length can be adjusted for different screw lengths by simply loosening and tightening the set screws. Suitable for steel, aluminum and other metals, wood and plastic. Drill length can be adjusted for different screw lengths (comes with a handy hex wrench).Suitable for aluminium, wood (hardness less than 25 degrees) and plastic; ideal for production, maintenance or for all drilling jobs on the go. Suitable for woodworking.