Features Made of high quality material, high strength and hardness, strong structure, durable to use. High quality ER20 collet chuck block for clamping the spindle motor shaft. Spiral linear thread, more convenient clamping, faster replacement, high clamping force. Smooth surface, no scratches, stable performance. Suitable for lathes, drills, milling machines, drills, can clamp taps, drills, milling cutters. Collet chuck holder knife bar motor shafts clamping tool bar clamping tool round collet chuck holder shaft clamps tool bar lathe engraving machine accessories Features: Made of high quality material, high strength and hardness, strong structure, durable to use. High quality ER20 collet chuck block for clamping the spindle motor shaft. Spiral linear thread, more convenient clamping, faster replacement, high clamping force. Smooth surface, no scratches, stable performance. Suitable for lathes, drills, milling machines, drills, can clamp taps, drills, milling cutters. Specification: Model: C25-ER20-50L Mother type: ER20A Body length: 60 mm Axle hole: 6mm, 8mm, 10mm, 12mm, 16mm (Optional) Package list: 1 x collet holder Note: Please note that the new and old type of this product will be shipped randomly. Before ordering, make sure you don't mind. Package List