Specification Brand : TEN-HIGH BulletPoint1 : 【RAIL SIZE】Length: 120mm/4.68"; Width: 9mm/0.351"; Pitch: 20mm/0.78"; Rail fixing bolt size: M3x8 BulletPoint2 : 【BLOCK SIZE】Model: MGN9C (Pre-loaded); Length: 28.9mm/1.127"; Width: 20mm/0.78"; Block fixing bolt size: M3x3 (Please refer to Parameters Picture for more detailed information.) BulletPoint3 : 【ADVANTAGES】Made of high-quality passivated Bearing Steel with low friction coefficients, which has no resistance when put the bearings on the rail. Durable, corrosion resistance and smooth, perfectly fits most 3D Printer. And it works beautifully for both slider motion as well as panning. BulletPoint4 : 【APPLICATIONS】Professional and technical rail and block, suitable for most automatic equipment. Widely used for CNC parts, 3D printer, semiconductor manufacturing equipment, printed circuit boards, IC assembly equipment, medical equipment, robot arms, precision measurement machine and other small linear motion device, etc. BulletPoint5 : PACKAGE INCLUDES: 2pcs MGN9 120mm Rails, 2pcs MGN9C Blocks Color : Black ExternallyAssignedProductIdentifier1 : 0658099029565 ExternallyAssignedProductIdentifier2 : 658099029565 ItemName : TEN-HIGH MGN9 120mm Linear Guide Rail Linear Motion Slide Rails Linear Motion Products, for 3D Printer and CNC Machine, 2pcs Rails + 2pcs MGN9C Block Bearings ItemPackageDimensions_Height : 16.51 centimeters ItemPackageDimensions_Length : 1.6002 centimeters ItemPackageDimensions_Width : 4.9022 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : linear-motion-guides Manufacturer : TEN-HIGH Material : Carbon Steel Material1 : Aluminum Material2 : Alloy Steel ModelNumber : Aoje-Link-b21042201ap0106 NumberOfItems : 1 PartNumber : TH-2-MGN9-120-MGN9C ProductDescription : Notes: 1.If there doesn’t have the size you need or have special requirements, we can also customize as long as email us. 2. ABOUT THE RAIL: Our Mini Linear Guide Rail has 2 types, MGN and MGW, MGN is the standard type, and MGW is widened type, which means the MGW rail is wider than MGN rail. ABOUT THE BLOCKS: we provide C type (Standard type), and H type (Extended type). H blocks is longer than C blocks. Please choice the goods according to your needs. 3.After receive the package, please check the product at first. If there any problem, let us know in time, so that we can provide after-sales services for you. WE DON’T WANT OUR CUSTOMER TO WASTE THEIR TIME AND MONEY, AND WILLING TO PROVIDE THE BEST SERVECES.