these bits own edge which is for fast engraving that makes high efficiency;,high and not easy to break;it is smokeless and burr-free while processing For cutting/engraving/carving/grooving/slotting/drilling/hollowing/positioning/roughing/milling in materials like MDF,PVC,Acrylic,wood,solid wood,chipboard,composite board,organic board,core board,density board etc. the design of 2 flutes,mirror polishing,large chip space of CNC Router Bit makes non-stick crumbs,smooth cutting and -removal, Weight: 0.0992080179 Pounds, Manufacturer: Oewwthy