[Size] Suitable for 5/16 (8mm) shank hand drills and stand motor drills. Cutting diameter length: 7.93/9.52/12.7mm. [Material] This product is made of YG6 carbide, which has sharp cutting edges, high hardness, accurate positioning, smooth cutting and impact resistance. 【Scope of application】 These 1/4 shank router bits are suitable for solid wood boards, MDF, particle board, designer profiles for smooth and neat cuts and the production of fashionable furniture. They are also suitable for milling grooves in frames, panels, clocks, lathes and other wall tools to create keyhole hooks or to create grooves for electrical cables. [Features] Carbide blades have high-quality welding, providing stable quality and high efficiency, without worrying about breakage and tilting problems during work. The blade is sharp and durable, with an arc curve design for easy disassembly and more efficient drilling. [Inclusion list] Package contents: 1 x T-slot countersink for 1/2" hex screws; 1 x T-slot