Features: This linear rail and block are small in size and lightweight, especially suitable for small equipment. Adopting 4-point contact design, it can bear load from every direction, and has good strength and high accuracy. Designed with ball retainer, which allows interchangeability in the case of small precision. Block has lubrication system; lubrication oil can be easily put into the oil inlet on the side. Widely used for automatic equipment, precision measuring equipment, and many other machines that need precision linear movement. Specification: Model: MGN9H Slide Track: Linear rail Rail Length: 100mm / 3.94in Rail Width: 9mm / 0.35in Block Width: 20mm / 0.79in Block Thickness: 8mm / 0.31in Overall Thickness: 10mm / 0.39in Material: Bearing steel Weight: 64g / 2.3oz (approx.) Package list: 1 * Linear Guide Rail 1 * Linear Guide Block