Features: _x000D_ This linear rail and block are small in size and lightweight, especially suitable for small equipment. _x000D_ Adopting 4-point contact design, it can bear load from every direction, and has good strength and high accuracy. _x000D_ Designed with ball retainer, which allows interchangeability in the case of allowable precision. _x000D_ Slide block is designed with mini retaining steel wire, and the steel ball will not fall off if taking the slide block down._x000D_ _x000D_ Widely used for automatic equipment, precision measuring equipment, and many other machines that need precision linear movement. _x000D_ _x000D_ _x000D_ Specification: _x000D_ Model: MGN12H_x000D_ _x000D_ Type: Slide rail _x000D_ Slide track: Linear rail _x000D_ Length: 250mm / 9.8in, 300mm / 11.8in, 350mm / 13.8in, 400mm / 15.7in, 450mm / 17.7in, 500mm / 19.7in, 550mm / 21.7in (Optional) _x000D_ Width: 12mm / 0.5in _x000D_ Material: Bearing steel _x000D_ Precision class: H_x000D_ Block Fixation Method: Locked_x000D_ Weight: 217 ~ 416 g / 7.7 ~ 14.7 oz(approx.) _x000D_ _x000D_ _x000D_ Package list: _x000D_ 1 * Linear Guide Rail _x000D_ 1 * Linear Guide Block