Made from Tungsten Carbide, can be used to process: iron, steel etc. 1/8 inch 1/8 inch head diameter and 1/8 inch 1/4 inch head diameter. length: 45-50 mm( 1.77-2 inch). Great addition to tools,-pencil die grinder,compatible with ,,Beyond,,,Fixtec,,,,,,,,,,,,,,,, and so on. The groove lines of these carbide 's head are crossed, more suitable for an object whose density is relatively low, such as wood, , jade, ceramic, glass jewelry making,welding, chamfering, casting, deburring, grinding, cylinder head porting and sculpting, and some Soft Metal.Not for: Epoxy. Sharp,durable and balanced. The carbide set cuts through hard materials like a hot knife through butter. No wear out after a long time use. The shaft will not bend at high speed. Carbide set, packed with plastic case for safety storage and protection. High efficiency, high-quality finish, long service life, good economic returns.The working life of these solid is 10 than high-speed steel and 200 than grinding wheel. Material: Cemented carbide colour: silvery Package Contents: 20 x Rotating burrs Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real . The measurement allowed error is +/- 1-3cm.