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. these bits own edge which is for fast engraving that makes high efficiency;,high precision and not easy to break;it is smokeless and burr-free while processing the design of 2 flutes,mirror polishing,large chip space of CNC Router Bit makes non-stick crumbs,smooth cutting and -removal size: about 3.175x17x38.5mm Material: Metal colour: Silver Package Contents: 100 x Double edged milling cutter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.