Perfect Shaft Positioning - Designed for Linear Guides, perfect for DIY CNC projects. Quick and Easy Installation - Clamping design ensures secure installation with minimal effort. and - Made of aluminum alloy for long-term use. Secure Fixation without Damage - Set screws a tight grip without damaging the shaft. Shaft Collar is a high-quality retaining ring designed for use with linear guides and motion guide shafts, providing precise positioning and secure clamping for industrial applications.This aluminum alloy shaft collar is , rust-proof, and comes with an set screw for easy adjustment for CNC machines,3D printers, and automation systems,the clamping design ensures a secure grip to prevent slipping for linear motion systems,it improves stability and accuracy during operation. Type:SBR16 Colour:As Shown Material:Metal Package Contents: 6 * Shaft Collars Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.