Features: _x000D_ This linear rail and block are small in size and lightweight, especially suitable for small equipments. _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 small precision. _x000D_ Block has lubrication system; lubrication oil can be easily put into the oil inlet on the side. _x000D_ Widely used for automatic equipment, precision measuring equipment, and many other machines that need precision linear movement. _x000D_ _x000D_ _x000D_ Specification: _x000D_ Model: MGN12(linear rail), MGN12C(slide block)_x000D_ _x000D_ Type: Slide rail _x000D_ Slide Track: Linear rail _x000D_ Rail Length: 550mm / 21.7in _x000D_ Rail Width: 12mm / 0.5in_x000D_ _x000D_ Material: Bearing steel_x000D_ Block Fixation Method: Locked _x000D_ Weight: 432g / 15.2oz (approx.) _x000D_ _x000D_ _x000D_ Package List: _x000D_ 1 * Linear Guide Rail _x000D_ 2 * Linear Guide Blocks _x000D_ _x000D_ _x000D_ Note: Please allow small size error due to manual measurement. Thanks for your understanding.