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Your cart is empty."The linear motion products and technology are widely used for automatic mechanical facilities under common accuracy. Our rail shaft is made with good quality steel plus aluminum alloy. It is a perfect combination of main axle and aluminum support, which nicely stabilizes the original rail.key Features Complete Linear Rail Kits Linear rail kit includes 2 pieces of 2 pieces of 2200mm/86.5" long SBR20 rail shafts and 4 SBRUU bearing blocks. Corrosion-resistant, high strength, and wear resistance. High-Quality Material This bearing rail is constructed with carbon steel main axle and aluminum alloy support, bearing steel linear rail block, and aluminum alloy casing. High Hardness & Rigidity Surface chrome plating treatment beautiful anti-rust, high hardness, with high accuracy and strong durability. Complete Sliding Unit Cylindrical guide composed of principal rail and aluminum support, stabilizing the original rail. Premier quality bearing blocks moves smoothly while using. Easy To Assemble Aluminum material support rail with pre-drilled holes for ease of mounting. Widely Used The linear guides are perfect for your DIY routers, mills, lathes, widely used in the automation machinery such as machine tools, bending machines, laser welding machines, etc. Specifications Feature: Smooth motion Performance: Low noise Diameter: 20 mm (0.78") Rail Shafts: SBR20, 2200 mm (86.5") Gross Weight: 16 kg (36.9 lb) Package Dimensions: 223 10 9 cm (87.8" 3.9" 3.5") Package Content 2 X SBR20 2200mm Fully Supported Linear Rail Shafts 4 X SBR20UU Bearing Blocks"