SIZESuitable for 1/4 inch (6.35mm) shank hand drills and stand motor drive drill bits. Cutting diameter lengths: 7.93mm, 9.52mm, 12.7mm. MATERIAL: This product uses YG6 hard alloy with sharp edge, high hardness, precise positioning, smooth cutting, and impact resistance. APPLICATION: These 5/16 inch shank cutters are suitable for solid wood, MDF, particle board, and design profiles, providing smooth cuts and fine detailing for stylish furniture production. They are also ideal for milling grooves on frames, panels, clocks, and other wooden components for keyhole hangers or cable routing. FEATURES: The hard alloy blade features high-quality welding for stable performance and high efficiency, reducing the risk of breakage or tilting during operation. The blade is sharp and durable, with an arc curve design that enhances chip removal and improves drilling efficiency.