Features ⭐⭐⭐【Premium Material】Crafted from high-quality materials, our C20-ER16 collet chuck holder is built to last. With its strong structure and long service life, you can trust it to perform. ⭐⭐⭐【Designed for Spindle Motor Shaft】Our collet chuck holder is specifically designed for spindle motor shaft clamping. With an ER16 nut type and 40mm body length, it's the perfect fit for your needs. ⭐⭐⭐【High Performance】Our ER16 collet block features a spiral linear thread for more convenient clamping, high clamping force, and faster replacement. It's the perfect choice for those who demand the best. ⭐⭐⭐【Stable and Scratch-Free】Our C20-ER16 collet chuck holder has a smooth surface with no scratches, ensuring stable performance and a new and different using feeling. ⭐⭐⭐【Versatile Applications】Our collet chuck holder is suitable for lathes, drilling machines, milling machines, boring machines, and can clamp tap, drill, milling cutter. It's a versatile tool that you'll use time and time again. 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 Package List