Range of processing ---- Used for cutting/engraving/carving/drilling/sculpturing/milling in materials like MDF, acrylic, density board, solid wood, wood, plastics, PVC, PVC expansion sheet, PP, ABS, etc. High efficiency ---- these bits own sharp edge which is able for fast engraving that makes high efficiency; durable, high precision and not easy to break; it is smokeless and burr-free while processing Perfect cutting ---- the design of single flute, larger spiral chip space and mirror polishing of CNC Router Bit makes non-stick crumbs, smooth cutting and fast chip-removal Dimensions ---- diameter : 1/8" (3.175mm); cutting diameter: 3.175mm; cutting edge length (CEL)/flute length: 25mm; overall length (OAL): 50mm Package contents ---- 10pcs tungsten steel bits assorted in a plastic storage case