Material: The drill bit is made of tungsten steel, high wear resistance and heat resistance, good toughness. Durable, drilling chamfer, a more practical solution Three-point positioning: Three-point centering is better, not easy to slip and no bias. Precise and fast drilling Fast chip evacuation: The 5 flute wood spiral drill bit has large chip flutes for fast removal of sawdust to achieve a smooth surface on any type of hardwood, cork or aluminum Removable and adjustable: Adjustable wood router bit sleeve depth with wrench, 7 different sizes for your various needs Different size: The twist wood bits are 3mm, 4mm, 5mm, 6mm , 7mm, 8mm, 10mm. Round handle design is suitable for bench drill, hammer drill, for drilling machines with chuck on hardwood or wooden floor