Specification Brand : ACROPIX BulletPoint1 : 2 Pcs Universal Bearing Steel Linear Ball Bearings. BulletPoint2 : Feature: These LMK12UU Linear Ball Bearings are made from durable bearing steel, size: 25x40x59mm. BulletPoint3 : To replace your Linear Ball Bearing if it made noise, cracked, low speed and bad friction while working. BulletPoint4 : Easy Installation - The table needs to be level during installation, otherwise it will interfere with installation calibration. BulletPoint5 : Note: Please confirm the model number and dimension before buying, thanks! Color : Silver Tone ExternallyAssignedProductIdentifier : 9810875154545 ItemName : ACROPIX LMK25UU 25mm IDx40mm ODx59mm Length Square Flange Linear Ball Bearings Silver Tone - Pack of 2 ItemPackageDimensions_Height : 2.95 inches ItemPackageDimensions_Length : 5.91 inches ItemPackageDimensions_Width : 3.94 inches ItemPackageQuantity : 2 ItemTypeKeyword : linear-ball-bearings Manufacturer : ACROPIX Material : Alloy Steel ModelNumber : accar2305200015 NumberOfItems : 1 PartNumber : accar2305200015 ProductDescription : Features: Pre-lubricated, smooth and flat bearing surface, compact structure, with strong bearing capacity and dust-proof, long service time. Suitable for high-speed, low friction, low-noise and low vibration, improve efficient and steady work. High temperature quenching forging, sturdy and durable in operation, these deep groove ball bearings combine radial and load at high speed. Mainly applicated with guideways of linear tables, 3D printers rail unit, engraving machines and other common machine guideway etc.