Features: This linear rail and block are small in size and lightweight, especially suitable for small equipment. Adopting a 4-point contact design, it can bear loads from every direction, and has good strength and high accuracy. Designed with a ball retainer, which allows interchangeability within allowable precision. The slide block is designed with a mini retaining steel wire, preventing the steel balls from falling out when the block is removed. Widely used in automatic equipment, precision measuring equipment, and other machines requiring precision linear movement. Specification: Model: MGN12H Type: Slide rail Slide track: Linear rail Length: 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm (Optional) Width: 12mm Material: Bearing steel Precision class: H Block Fixation Method: Locked Weight: 217 ~ 416 g (approx.) Package list: 1 x Linear Guide Rail 1 x Linear Guide Block