Material: The drill bit is made of tungsten steel, which is wear-resistant, heat-resistant, and has good toughness. Durable, drilling and chamfering, a more practical solution. Three-point positioning: Three-point alignment is better, not easy to slip, and not skewed. Accurate and fast drilling. Fast chip removal: The 5-blade spiral wood drill has a large chip flute, which can quickly remove sawdust and achieve a smooth surface on any type of hardwood, softwood, or aluminum. Removable and adjustable: The depth of the wood cutter sleeve can be adjusted with a wrench, and 7 different sizes can meet your different needs. Various sizes: 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm spiral wood drill bits. The round shank design is suitable for bench drills, hammer drills, and drills with chucks on hardwood or hardwood floors. Package size: 22 cm x 17.5 cm x 2.5 cm Shipping quantity: 1 set, including 7 drill bits, 1 wrench