Features 1、Made of high quality steel material for long service life 2、Small body and it has stable performance 3、The nut is designed with no wind resistance to ensure more stable machining at high speed. 4、It has high heat strength and oxidation resistance, strong toughness and super wear resistance. 5、The close cooperation of the cutting force of the tool on the workpiece to the guide column reduces the resonance and makes the machining accuracy more stable. Specification Features: 1. Made of high quality steel material for long service life 2. Small body and it has stable performance 3. The nut is designed with no wind resistance to ensure more stable machining at high speed. 4. It has high heat strength and oxidation resistance, strong toughness and super wear resistance. 5. The close cooperation of the cutting force of the tool on the workpiece to the guide column reduces the resonance and makes the machining accuracy more stable. Specification: Condition: 100% Brand New Model: BT30-ER16-70 Material: 20CRMnTi Standard Speed: 10000rpm Hardness: >HRC56D° Accuracy: <0.005mm Carburizing Depth: >0.8mm Overall Clamping Jump: less than or equal to 0.005um Roundness: <0.8um Surface roughness: >0.8mm L1 Length: Approx. 70mm / 2.8in d1 Length: Approx. 28mm / 1.1in Package List: 1 x Holder Package List