describe Wood Drill Bit Kit - Comes with 8 wood countersunk bits, a hex wrench and a storage box. Twist wood is available in 3mm (2pcs), 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, enough to meet your various needs. STURDY AND DURABLE - Our wood drill bits are made of HSS steel, which has high hardness, good wear resistance and high heat resistance. Great for drilling holes in wood, plastic, rubber, PVC and other materials, not a power tool, not suitable for hard objects like steel, iron, stone, etc. Uses - The wood countersink is used for drilling holes in wooden floors or other hard woods, suitable for bench drills, hammer drills, drilling machines with chucks, etc. Quick Chip Evacuation - Twist wood features chip flutes and a five-sided beveler to quickly evacuate sawdust for a smooth finish on any hardwood. ADJUSTABLE LENGTH - The woodworking router bit set comes with an adjustable hex socket, which can be adjusted to various lengths of screws by loosening and tightening the screws. Also available for quick release accessories. Color: Forest Wood feature: Suitable for wood, plastic, rubber and more, it is ideal for portable production, repair or drilling work. The drilling length can be adjusted for different length screws by simply loosening and tightening the grub screw. The round handle has a smooth shape, no friction with the machine, and fits most bench drills or hand drills. Try to keep the drill bit vertical when drilling to avoid unevenness. Specification: Material: high speed steel black aspect: 3mm(diameter) x 60mm(length) 4mm (diameter) x 75mm (length) 5mm(diameter) x 85mm(length) 6mm(diameter) x 93mm(length) 7mm(diameter) x 100mm(length) 8mm (diameter) x 110mm (length) 10mm (diameter) x 120mm (length) package: 8 x wood drill 1 x Hex socket