1 Piece High Carbide Tire Repair Bit. The cutter head is made of high carbon steel alloy, featuring high hardness, strong wear resistance, and heat resistance. It can process cast iron, cast steel, alloy steel, stainless steel, carbon steel, aluminum, copper, and other metals, as well as non-metals such as marble, bone, jade, etc., with a processing hardness up to HRA85. Durability is several times higher than high-speed steel cutters and small grinding wheels. Processing efficiency is significantly higher than manual files and shank-mounted small grinding wheels. Provides high-quality processing with excellent surface finish. Suitable for various high-precision mold cavities. Color: As shown. Material: Metal. Size: 8mm. Package includes: 1 x Drill Bit. Only the above items are included; other products are not included. Note: Lighting and display differences may cause slight variations in color. Measurement may vary by +/- 1-3cm.