Features DURABLE MATERIAL: The linear rod is made of steel, chrome plated, has high strength and wear resistance, not easy to rust. EASY OPERATION: The linear motion rod has high precision and stable structure, which is easy to install and operate. WIDE APPLICATION: Suitable for various guide rods of electronic devices, drive shafts, pillars, etc., convenient to use. 2PCS IN 1 SET: Includes 2 x 8mm linear shafts, with standard size, and are common accessories for 3D printers. GLOSSY SURFACE: These linear track cylinders have a glossy surface that will not scratch or wear the equipment when used. Specifications: Item Type: 8mm Linear Shaft Material: Steel Diameter: approx. 8mm/0.3" Purpose: 3D printer parts Package List: 2 linear shafts Package List 2 x Linear Shafts