Specification Brand : NDNCZDHC BulletPoint1 : Shaft Fixation: These shaft collars are designed for linear rail shaft fixation and positioning, making them ideal for DIY CNC machine tools. With an inner diameter of 12mm, outer diameter of 30mm, and thickness of 10mm, these collars offer precise and secure shaft placement. BulletPoint2 : Seamless Integration: This linear rail shaft collar set is engineered to seamlessly integrate with the shaft, ensuring easy installation and a tight fit. Its design enhances overall stability, making it a component for your mechanical projects. BulletPoint3 : Secure Fastening: Featuring a M4 fixing screw, this limit fixing ring securely clamps onto the shaft without causing any damage. It ensures stable shaft fixation, offering peace of mind for long-term use. BulletPoint4 : Aluminum Alloy Made: Crafted from aluminum alloy, this shaft stop collar is lightweight. Its robust construction ensures it is resistant to breaking or damage, making it ideal for demanding applications. BulletPoint5 : Oxidation Resistant Surface: The surface of this shaft collar is specially treated to be oxidation resistant, ensuring long-lasting performance even in harsh environments. It maintains its integrity and functionality under challenging conditions. Color : Silver ItemName : NDNCZDHC 4 Pcs Shaft Collar Set for Linear Rail SBR12, Shaft Collars 12mm ID 30mm OD 10mm Thickness Shaft Limit Fixing Rings with M4 Screw ItemPackageDimensions_Height : 2 centimeters ItemPackageDimensions_Length : 7 centimeters ItemPackageDimensions_Width : 6 centimeters ItemTypeKeyword : clamp-on-shaft-collars Manufacturer : NDNCZDHC Material : Aluminum ModelName : NDNCZDHCverif38adk ModelNumber : NDNCZDHCverif38adk NumberOfItems : 1 NumberOfLithiumMetalCells : 1 PartNumber : NDNCZDHCverif38adk ProductDescription : Item Type: Linear Rail Shaft Collar Material: Aluminum Alloy Inner Diameter: Approx. 12mm/0.47in Outer Diameter: Approx. 30mm/1.18in Thickness: Approx. 10mm/0.39in Screw Hole: M4