Features:Thislinear rail and blockare small in size andlightweight, especially suitable for small equipments.Adopting 4-point contact design, it canbear load from every direction, and has good strength and high accuracy.Designed with ball retainer, which allowsinterchangeability in the case of small precision.Blockhaslubrication system; lubrication oil canbe easily put into the oil inlet on the side.Widely used for automatic equipment,precision measuring equipment, and many other machines that need precisionlinear movement.Specification:Model: MGN12(linear rail), MGN12B(slide block)Type: Slide railSlideTrack: Linear railRailLength: 400mm / 15.7inRailWidth: 12mm / 0.5inMaterial: Bearing steelBlock FixationMethod: LockedWeight: 336g / 11.9oz (approx.)Package List:1 *Linear Guide Rail 2 * LinearGuideBlocksNote: Please allow small size error due to manual measurement. Thanks for your understanding..