Made from Tungsten Carbide, can be used to process: iron, steel etc. 1/8 inch shank 1/8 inch diameter and 1/8 inch shank 1/4 inch diameter. Total length: 45-50 mm( 1.77-2 inch). Great addition to rotary tools,Micro-pencil die grinder,compatible with ,,Beyond,,,Fixtec,,,,,,,,,,,,,,Wen,, and so on. The groove lines of these carbide rotary burr's are crossed, more suitable for an object whose density is relatively low, such as wood, marble, jade, ceramic, glass jewelry making,welding, chamfering, casting, deburring, grinding, cylinder porting and sculpting, and some Soft Metal.Not for: Epoxy. , and well balanced. The carbide burr 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 burr set, packed with nice plastic case for safety storage and protection. High efficiency, high-quality , long service life, good economic returns.The working life of these solid rotary burr is 10 times longer than high-speed steel and 200 times longer 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.