C20-ER16-40L Collet Block Chuck Collet Holder Spindle Motor Shaft Clamping Tool Bar (12mm) Features: Made of premium material, high strength and hardness, strong structure, durable in use. ER16 collet block for spindle motor shaft clamping. Spiral linear thread, more convenient clamping, faster replacement, high clamping force. Smooth surface, no scratches, stable performance. Suitable for lathes, drilling machines, milling machines, boring machines, can clamp tap, drill, milling cutter. Specification: Model: C20-ER16-40L Nut type: ER16A Body length: Approx. 40mm / 1.57 Axle hole: Approx. 6mm / 0.24in                 Approx. 8mm / 0.31in                 Approx. 10mm/ 0.39in                 Approx. 12mm/ 0.47in                 Approx. 16mm/ 0.63in (Optional) Package List: 1 x Collet Chuck Holder