5 sizes (5/32inch-5/162inch) of 4 flutes designed carbide end mill set, work perfect on milling, CNC or cutting machines, 2D/3D carving, spiral blade with sharp end, fast cutting and engraving Spiral design, more space for fast and clean chip removal, High efficiency and stability, it will not stick blade or create crumbs, allowing excellent processing the high-side and bottom finish when processing in a proper way High quality heat-treated titanium tungsten carbide construct milling cutter set provide good toughness and resistance, sharp and sturdy 1/4in or 5/16in Straight shank solid power tool carbide router bit fit most small rotary tools, woodworking drilling carving engraving, making DIY carving fans much easier to do the wood working job 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