About this item. SIZE Suitable for 5/16 (8mm) shank hand drill bits, stand motor drive drill bits. cutting diameter length: 8 / 9.5/ 12.7 mm. MATERIAL This product uses YG6 hard alloy with sharp edge, high hardness, positioning precise, smooth cutting and impact resistance. APPLICATION These 1/4 shank router bits are suitable for solid wood panels, MDF, chipboard, design profiles, for smooth and meticulous cuts as well as for the production of stylish furniture. They are also suitable for milling grooves on picture frames, panels, clocks, towers and other wall tools to create keyhole hangers or to create grooves for cables. < /p> FEATURES The hard alloy blade has high-quality welding to provide stable quality and high efficiency, without worrying about broken and sloping problems during your work. The blade is sharp and durable, adopts arc curve design, beneficial to remove, punching is more effective. INCLUDE LIST Package Content: 1 x Groove Cutter T-slot for 1/2" hex screws; 1 x T-slot cutter for 3/8" hex screws; 1 x T-slot cutter for 5/16 hex screws.