Product Description: Material: Made of HSS Steel Color: Black Dimension: 3mm(Dia) x 60mm(L) 4mm(Dia)x 75mm(W) 5mm(Dia) x 85mm(L) 6mm(Dia)x 93mm( L) 7mm(Dia) x 100mm(L) 8mm(Dia)x 110mm(L) 10mm(Dia) x 120mm(L) Package: 8 x Wood Drill Bit 1 x Hex Sleeve WOOD DRILL BIT KIT- It comes with 7pcs wood countersink drill bit, a hex wrench . The twist wood bits are 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 10mm, enough to meet your varieties of needs. DURABLE & STURDY- Our wood bit is made of HSS steel, high hardness, good wear resistance, high heat resistance. Perfect for drilling in wood, plastic, rubber, PVC and other materials, not a power tool, can't fit hard things like steel, iron, stone. USES- Woodworking router bits are used for drilling on wooden floor or other hard woods, suitable for bench drill, hammer drill, for drilling machines with chuck and more. QUICK CHIP DISCHARGE- The wood twist drill bits have the chip flutes and five-edge beveling machine, can discharge sawdust fast to get a smooth surface on any kind of hard wood. ADJUSTABLE LENGTH - The woodworking router bit kit accompanied with a hexagon sleeve which is adjustable, to adjust the various length screws by loosening and tightening the screw. can also be used for quick dismantling of accessories.