Body of the holder is made of tool steel, durable in use. 5 x Spare HSS knurls along. High strength and hardness. Anti-rust resistant, high processing efficiency. Rigidity, wear resistance, anti-demolition damage strength. FEATURE: Supplied with 3 Pcs HSS rollers in diamond & straight pitch in Coarse, Medium (*straight medium knurl fitted in the tool holder) & Fine each. So the set includes 1 x knurling tool holder & 5 spare HSS knurls. SIZE & COLOR: Black (Knurling) holder size 10 x 10 x 100 mm. HSS Knurl 3/4" (diameter) x 1/8" (wide) x 1/8" (bore); USEFUL: Ideal for replacing your damaged Linear & diamond knurl wheel. Used for processing the work piece surface pattern. USEFUL: Ideal for replacing your damaged Linear & diamond knurl wheel. Used for processing the work piece surface pattern. PACKAGE: Include 1Pc Knurling and 5 Pcs knurling wheels