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 skew. Accurate and fast drilling Fast chip removal: The 5 flutes twist wood drill bit has large chip flutes for fast sawdust removal to achieve a smooth surface on any type of hardwood, cork or aluminum Removable and adjustable: Adjustable wood drill sleeve depth with a wrench, 7 different sizes for your various needs Different size: The twist wood drill bits are 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm. Round handle design suitable for bench drill, impact drill, for drilling machines with chuck on hardwood or wooden floor Features: Suitable for wood, plastic, rubber, etc., ideal for production, maintenance or portable drilling work. The drilling length can be adjusted for different length screws by simply loosening and tightening the grub screws. The