Features: These linear rails and blocks are small in size and lightweight, especially suitable for small equipments. Adopting 4-point contact 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. Blocks have 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. Specifications: Model: LML12H (rail), MGN12H (block) Type: Slide rail Slide Track: Linear rail Length: 400mm/15.7in Material: Bearing steel Accuracy Class: H Block Fixation Method: Locked Weight: 673g(approx.) Package Includes: 2 x Linear Guide Rails 2 x Linear Guide Blocks 1These linear rails and blocks are small in size and lightweight, especially suitable for small equipments 2Adopting 4-point contact design, it can bear load from every direction, and has good strength and high accuracy 3Designed with ball retainer, which allows interchangeability in the case of small precision 4Blocks have lubrication system; lubrication oil can be easily put into the oil inlet on the side 5Widely used for automatic equipment, precision measuring equipment, and many other machines that need precision linear movement