Features: This linear rail and block are small in size andlightweight, especially suitable for small equipment. 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. Block has lubrication 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: MGN9HSlide Track: Linear rail Rail Length: 100mm / 3.94in Rail Width: 9mm / 0.35in Block Width: 20mm / 0.79inBlock Thickness: 8mm / 0.31inOverall Thickness: 10mm / 0.39inMaterial: Bearing steelWeight: 64g / 2.3oz (approx.) Package list: 1 * Linear Guide Rail 1 * Linear Guide Block .