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 burr'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 well balanced. The carbide burr set cuts through hard materials like a hot knife through . No wear out after a long time use. The shaft will not bend at high speed. Carbide burr 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 burr 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 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.