Industrial-grade standard SBR block, with high linear bearing inside.<br> Surface silver plating treatment, beautiful anti-rust, hardness can as high as HRC62, more durable.<br> The adjusting handle can adjust the tightness of the slider.<br> Standardized processing, perfect for rail positioning. Perfect for your DIY routers, mills, lathes.<br> Aluminum alloy support rail with pre-drilled holes for ease of mounting.<br> Type: Linear<br> Glide path: linear<br> Rated dynamic load: 860<br> Rate static load: 1370<br> grade: H<br> Fixed size: 8 (mm)<br> Fixed mode of sliding block: Locking type<br> Allowed static torque: 1 (kn.m)<br> Weight:1050g<br> colour:Silver<br> Material:metal<br> size: Linear Rails- 500mm / 19.7inch (Length) x 12mm / 0.47inch (Diameter); Linear Bearing Side Blocks -40mm x 40mm x 28mm/1.57 x1.57 x1.10inch( Length x Width x Height)<br> Package Contents:<br> 1 x linear<br> 2 x Linear bearing slider<br> Only the above package content, other products are not included.<br> Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.