Features: Versatile CNC End Mill Set -- 5 sizes (5/32inch-5/162inch) of 4 flutes designed high speed steel mill set, work perfect on milling, CNC or cutting machines, 2D/3D carving, spiral blade with sharp end, fast cutting and engraving. Clean & Fast Chip Removal -- Spiral design, more space for fast and clean chip removal, High efficiency and stabality, it will not stick blade or create crumbs, allowing excellent processing the high-side and bottom finish when processing in a proper way. Premium Quality -- High quality heat-treated high speed steel construct milling cutter set provide good toughness and resistance, sharp and sturdy. Strong Compatibility -- 1/4in or 5/16in Straight shank solid power tool HSS router bit fit most small rotary tools, woodworking drilling carving engraving, making DIY carving fans much easier to do the wood working job. Wide Application -- Widely used for cut, carve, chamfer, engroove, hollow and so no, function like most US router bits. Apply to wood, steel, stainless steel, alloy steel, carbon steel, die steel, tool steel, cast iron, titanium, aluminum, etc. Specification: Material: High speed steel Cut End: 4-Flute Shank Diameter: 5/16in, 1/4in, 3/16in, 5/32in, 1/8in Cutting Edge Dia: 5/16in, 1/4in Cutting Edge Length: 1/8in, 3/4in, 9/16in, 3/4in, 7/16in Overall Length: 2-5/8in, 2-1/2in, 2-3/8in, 2-1/2in, 2-3/8in Packing List: 5 * 4-Flute Mill Cutter 5 * Plastic Case