Size: Fits 5/16 (8mm) shank hand drills, with stand motor drills. Cutting diameter length: 8 / 9.5 / 12.7mm. [Material] This product uses YG6 hard alloy, with sharp cutting edge, high hardness, precise positioning, smooth cutting and impact resistance . [Application] These 1/4 handle knives are suitable for solid wood boards, MDF, particle board, designer profiles, for smooth and fine cutting and fashionable furniture production. They are also suitable for milling grooves in frames, panels, clocks, hangers and other wall tools to create keyhole hangers or create grooves for cables. [Features ] Hard alloy blades, high welding quality, stable quality, high efficiency, no need to worry about breaking and tilting when working. The blade is sharp and durable, and it is designed with an arc curve, which is easy to disassemble and has higher punching efficiency. [Include List] Package Content: 1 x for 1/2" hex screws; 1 x for 3/8" hex screws; 1 x T-slot cutter for 5/16" hex screws. Cemented carbide cutting edge (YG6X cemented carbide). Cutting is clean, rotation is smooth and torsion resistance is strong. Precision ground rod can be stably fixed in the fixture. Smooth rotation, good wear resistance and long service life life. The coating of the milled body provides better chip evacuation and reduced friction. Shaft diameter: the size is shown in the figure. Installation Guide: It is important to use the normal speaker size. The tool should be fully inserted into the housing and tightened. Apply clamping force during the cutting process and partially insert it into the case, otherwise the tool holder will be damaged. For professional woodworking, it can be used for different types of wood : medium soft and hard wood, medium density fibreboard, plastic, plywood. Manual: 1. The temperature of the material becomes very high and may even emit smoke after prolonged operation. Please always note that the refrigerant must be topped up during operation. 2. Replace the device with a new tool to avoid damage to the cutting tool or injury from dull wood products. 3. Please use the tool to select a blade larger than the workpiece. 4. Wear safety glasses during operation.