Specification Brand : Hilitand BulletPoint1 : 【wide application】This linear rail and block are small and lightweight, suit for small equipment. Especially suit for automatic equipment, precision measuring equipment, and many other machines that need precision linear movement. BulletPoint2 : 【block has lubrication system】Block has lubrication system; lubrication oil can be easily put into the oil inlet on the side, will work smoothly. BulletPoint3 : 【variety size and exquisite quality 】This rail set is made of exquisite quality bearing steel which is sturdy and has a long service life, 5 size for you to choose, can meet your different needs. BulletPoint4 : 【good strength and high accuracy.】This linear rail set adopted 4-point design, it can bear load from every direction, and has good strength and high accuracy. BulletPoint5 : 【ball retainer】This linear rail set designed with ball retainer, which allows interchangeability in the case of small precision. ItemName : LML12B 12mm Linear Rail Mini Bearing Steel Rail Slide Rail+ Slide Block Variety Length (450mm) ItemPackageDimensions_Height : 47.1 centimeters ItemPackageDimensions_Length : 2.2 centimeters ItemPackageDimensions_Width : 4.2 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : linear-motion-guides Manufacturer : Hilitand Material : Metal NumberOfItems : 1 PartNumber : Hilitand1ntairqg97-01 ProductDescription : Features: This linear rail and block are small in size and lightweight, especially suitable for small equipments. Adopting 4-point design, it can bear load from every direction, and has good strength and high accuracy. Designed with ball retainer, which allows interchangeability in the case of small precision. Block has lubrication system; lubrication oil can be easily put into the oil inlet on the side. Widely used for automatic equipment, precision measuring equipment, and many other machines that need precision linear movement.