Item Type: Linear Guide Material: Stainless steel Model: MGW12C-500-2R Slide Block Size: Approx. 46 x 40 x 10.5mm / 1.8 x 1.6 x 0.4in Slide Rail Size: Approx. 500mm / 19.7in Slide Rail Fixing Bolt Size: M4 x 8 Package List 1 x Linear Guide 1The slider has a high-rigidity ball retainer to ensure safety during transportation and is easy to assemble during use. 2The miniature guide rail adopts a tworow ball circulation design with a contact angle of 45 and a uniform load. 3The guide rail uses larger size steel balls to fully demonstrate the high load and high torsion functions. 4The slide rails, sliders and balls are all made of stainless steel hardened heat-treated materials, which are rust and corrosion resistant. 5Use standard bolts to fix, can run stably and not easy to slip, and can be accurately positioned.