Specification Brand : Walfront BulletPoint : Package Include : ONE BEARING 6203 2RSH/C3 SKF BulletPoint1 : These bearings are made from high quality carbon steel for durability and long service life BulletPoint2 : There comes total 20 pieces bearings which you may use for many different projects BulletPoint3 : They are double shielded to avoid contaminants entering and save lubricant BulletPoint4 : Bearings have 1.4mm deep V that generally ride on a rail or track BulletPoint5 : These are bearings that are used in many linear motion systems ExternallyAssignedProductIdentifier1 : 663862609271 ExternallyAssignedProductIdentifier2 : 0663862609271 IncludedComponents : inc ItemName : 20pcs Miniature Pulley V623ZZ Miniature Steel Metal V Pulley Rail Ball Bearing Miniature Pulley Bearing Pulley 3x12x4mm for Rail Track Liner Motion System ItemPackageDimensions_Height : 10 centimeters ItemPackageDimensions_Length : 1.7 centimeters ItemPackageDimensions_Width : 5.5 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : deep-groove-ball-bearings Manufacturer : Walfront Material : Alloy Steel ModelNumber : Walfronti9md52w4az NumberOfItems : 1 PartNumber : Walfronti9md52w4az ProductDescription : 20pcs V623ZZ Miniature Steel V- Pulley Rail Ball Bearing 3x12x4mm for Rail Track Liner Motion System Wire pulley , small dimension, easy to install and use. This item is ordinary precision, adaptation to low speed, low load applications Made of high carbon steel, with long service life.