Features: 1. Made of high quality carbon steel material, durable and long service life. 2. After high temperature quenching, greatly improve hardness, wear resistance, strength and toughness 3. The lathe turning toll holder is of vacuum nitriding treatment, the hardness of surface is higher and more wear-resistant. 4. It can reach the function of extending the arbor, specially clamp below 6-8mm 5. It is a tool for assisting the machining of the inner hole of the lathe and preventing the knife from vibrating. Specification: Condition: 100% Brand New Material: Carbon Steel Optional Style: SHB16-06-100L, SHB20-06-100L, SHB20-07-100L, SHB20-08-100L Outer Diameter Inner Diameter Length SHB16-06-100L 16mm /0.6in 6mm / 0.24in 100mm / 3.94in SHB20-06-100L 20mm /0.8in 6mm / 0.24in 100mm / 3.94in SHB20-07-100L 20mm /0.8in 7mm / 0.28in 100mm / 3.94in SHB20-08-100L 20mm /0.8in 8mm / 0.31in 100mm / 3.94in Package List: 1 * Lathe Turning Tool Holder Package List 1Made of high quality carbon steel material, durable and long service life. 2After high temperature quenching, greatly improve hardness, wear resistance, strength and toughness 3The lathe turning toll holder is of vacuum nitriding treatment, the hardness of surface is higher and more wear-resistant. 4It can reach the function of extending the arbor, specially clamp below 6-8mm 5It is a tool for assisting the machining of the inner hole of the lathe and preventing the knife from vibrating.