Features Superior Construction: Crafted from premium materials, our C25-ER20-50L Collet Chuck Holder boasts exceptional strength and hardness. The robust structure ensures durability and reliability, suitable for heavy-duty use in CNC machining. ER20 Collet Compatibility: Designed for precision, this collet block chuck is ideal for spindle motor shaft clamping. It's compatible with ER20 collets, making it a versatile tool for professionals seeking efficient and secure clamping. Efficient Clamping Mechanism: Featuring a spiral linear thread design, our collet holder allows for quick and easy collet changes. This design increases the clamping force, ensuring optimal performance during operations, and reducing downtime in tool replacement. Precision and Smooth: Our chuck holder is engineered to operate smoothly without leaving scratches, ensuring consistent performance and maintaining the integrity of your spindle motor. Versatile Tool Application: The C25-ER20-50L Collet Holder is an essential tool for various machinery including lathes, drill presses, milling machines, and boring machines. It's capable of securely clamping taps, drills, and milling cutters, enhancing versatility and productivity in your workshop. 1. Made of premium material, high strength and hardness, strong structure, sturdy in use. 2. Premium ER20 collet block for spindle motor shaft clamping. 3. Spiral linear thread, more convenient clamping, faster replacement, high clamping force. 4. Smooth, no scratches, stable performance. 5. Suitable for lathes, drilling machines, milling machines, boring machines, can clamp tap, drill, milling cutter. Specification: Model: C25-ER20-50L Nut type: ER20A Body length: 60mm Axle hole: 6mm, 8mm, 10mm, 12mm, 16mm (Optional) Package List:1 x Collet Chuck Holder Package List