Industrial-grade standard SBR block with high linear bearing inside. Surface silver plating treatment provides anti-rust protection and durability, with hardness up to HRC62. The adjusting handle allows control over the tightness of the slider. Standardized processing ensures precise rail positioning. Suitable for DIY routers, mills, and lathes. Aluminum alloy support rail features pre-drilled holes for easy mounting. Type: Linear Glide path: Linear Rated dynamic load: 860 Rated static load: 1370 Grade: H Fixed size: 8 mm Fixed mode of sliding block: Locking type Allowed static torque: 1 kN·m Weight: 1050g Color: Silver Material: Metal Dimensions: Linear Rails: 500mm / 19.7 inches (Length) x 12mm / 0.47 inches (Diameter) Linear Bearing Side Blocks: 40mm x 40mm x 28mm / 1.57 x 1.57 x 1.10 inches (L x W x H) Package Contents: 1 x Linear Rail 2 x Linear Bearing Sliders Note: Light and display differences may cause slight variations in color. Measurement error allowed is +/- 1-3 cm.