【Carbide Steel Material】This 8mm router bit is made of high quality carbide steel cutting head by surface treatment, anti-wear. anti-rust and anti-oxidation. It features super-sharp blades by heat treatment, allowing you to extend boards and connect one piece of wood to another by creating joints. 【Precision Cuts】Industrial grade micro-grain carbide tips ensure consistently smooth finishing cuts. It precisely creates gaps or tongues and grooves to easily fasten two pieces of wood together, providing smooth and clean results. 【Suitable for】This drill bit is suitable for sealing the edge of wood or end to end, without splintering or cut edges. The bit can be used for grooving wood, chipboard, compact plywood board, which can make drawer, floor, cabinet door, etc. 【Safe Operation】Anti-kickback design can control the depth of cutting, prevent sudden unintentional movement of the tool or workpiece. You can use it with peace of mind. Please avoid cutting metal.