● Tungsten steel carbide rotary burrs bits widely used in machining iron, steel casting, carbon steel, alloy steel, stainless steel, hardened steel, copper aluminium etc.● Ideal for cleaning up welds, grinding weld beads, shaping parts, smoothing rough castings, or porting cylinder heads. ● Tungsten steel double cut solid carbide burr bits for metal working inmold and patternmaking, die sinking, surface cleaning and maintenance. Warm Tips:⚠ Ensure your burr shank is well inserted into your collet and clamped down tightly. ⚠ Please wear an eye mask to protect your eyes from filings.