Features AXLE FIXATION: SBR linear rail collar is used for DIY CNC machine tools, ensuring accurate positioning and fixation of the axle. PERFECT FIT: Linear rail stop collars are designed to perfectly mesh with the axle, making them easy to install for convenient use. ALUMINUM ALLOY MATERIAL: Made from premium aluminum alloy material, lightweight yet durable, with excellent resistance to oxidation and corrosion. SECURE FASTENING: The axle can be tightly clamped with fixing screws, ensuring a secure grip without causing damage. And ensures a stable operation. LONG LASTING PERFORMANCE: With its robust construction and reliable fixing capabilities, the SBR linear collars provide long lasting performance, making it a reliable choice. Specification: Item Type: Linear Rail Stop Collars Material: Aluminum Alloy Inner Diameter: Approx. 16mm / 0.63in Outer Diameter: Approx. 35mm / 1.38in Thickness: Approx. 10mm / 0.39in Screw Hole: M4 Package List:4 x Stop Collars Package List 4 x Stop Collars