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. those bits personal sharp edge which is for immediate engraving that makes immoderate efficiency;durable,high precision and never clear to break;it is smokeless and burr-free whereas processing the design of 2 ,mirror polishing, chip subject of CNC Router Bit makes non-stick crumbs, reducing and -removal size:about three Material:Metal colour:Silver Package Contents: 10 x Double edged milling cutter Only the above equipment content, other products aren't included. Note: Light and diverse reveals could cause the colour of the item within the photo just a little diverse from the real thing. The size allowed error is +/- 1-3cm.