Specification Brand : Yuecoom BulletPoint1 : [Shaft Fixation] These shaft collars are used for linear rail shaft fixation and positioning, ideal for DIY CNC machine tools. Featuring 12mm inner diameter, 30mm outer diameter, 10mm thickness. BulletPoint2 : [Seamless Integration] Designed to perfectly mesh with the shaft, this linear rail stop collar ensures easy installation and a tight fit, enhancing stability. BulletPoint3 : [Secure Fastening] Equipped with a M4 fixing screw, the limit fixing ring securely clamps onto the shaft without causing damage, providing reliable and stable fixation. BulletPoint4 : [Aluminum Alloy Made] Crafted from aluminum alloy, this shaft stop collar is lightweight yet sturdy, not easy to be broken or damaged. BulletPoint5 : [Erosion Prevention] Its surface is resistant to oxidation and erosion, ensuring long lasting performance even in demanding environments. ItemName : Yuecoom 4pcs SBR Linear Rail Shaft Stop Collars, Aluminum Alloy Shaft Limit Fixing Rings Parts with Set Screw Bore 12mm OD 30mm Thickness 10mm ItemPackageQuantity : 1 ItemTypeKeyword : clamp-on-shaft-collars Manufacturer : Yuecoom PartNumber : Yuecoomkqg3twhbyc ProductDescription : Description: These shaft guides are suitable for transmission products, linear rail modules, engraving cutting machines, and various precision instruments.