SBR20 Linear Rail Kit: Includes two 78.74 in (2000 mm) linear rails and four slide blocks. It is compatible with cutting machines, grinding machines, milling machines, drilling machines, and other equipment Rust & Corrosion Protection: Crafted from high-hardness carbon steel shafts (HRC58–66) and aluminum alloy blocks and supports. Each linear rail is coated with a more than 10 μm electroplated layer to resist rust and corrosion, even in humid basements Silent & Smooth Sliding: Built-in ball-bearing slide blocks deliver quiet, low-friction motion while gripping the shaft tightly for stable linear travel. Less noise, less wear, more precision—every time you move High Precision, No Deviation: Feature a 0.1–0.22 μm surface finish and 5 mΩ straightness, paired with precise hole diameter and spacing, this linear slide rail set ensures easy installation and repeatable positioning, even over long travel distances

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