Features Made of high quality material, high strength and hardness, strong structure, durable in use. High quality ER20 collet block for clamping the spindle motor shaft. Spiral linear thread, more convenient tensioning, faster replacement, high clamping force. Smooth surface, no scratches, stable performance. Suitable for lathes, drills, milling machines, drills, can tension taps, drills, milling cutters. Features: Made of high quality material, high strength and hardness, strong structure, durable in use. High quality ER20 collet block for clamping the spindle motor shaft. Spiral linear thread, more convenient tensioning, faster replacement, high clamping force. Smooth surface, no scratches, stable performance. Suitable for lathes, drills, milling machines, drills, can tension taps, drills, milling cutters. Specification: Model: C25-ER20-50L. Nut type: ER20A. Body length: 60 mm. Axle hole: 6 mm, 8 mm, 10 mm, 12 mm, 16 mm (optional). Package list: 1 x collet holder. Note: Please note that the new and old type of this product will be sent at random. Please make sure you do not mind before ordering. Package List