Descriptions: _x000D_ The linear slide rail shaft is made of high quality carbon steel, and the bearing block is made of aluminum alloy, sturdy and durable. Perfect for your DIY CNC routers, no more unwanted errors in your machining work mills, lathes. _x000D_ _x000D_ _x000D_ Features: _x000D_ The linear slide rail shaft is made of high quality carbon steel, and the bearing block is made of aluminum alloy, sturdy and durable. _x000D_ Industrial-grade standard SBR block, with high precision linear bearing inside. _x000D_ Surface silver plating treatment, beautiful anti-rust, hardness can as high as HRC62, more durable. _x000D_ The adjusting handle can adjust the tightness of the slider. _x000D_ Standardized processing, ideal for guide rail positioning. _x000D_ Perfect for your DIY CNC routers, mills, lathes. _x000D_ _x000D_ Aluminum alloy support rail with pre-drilled holes for ease of mounting. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Material: high carbon steel, Aluminum alloy _x000D_ Rail shaft length: 1000mm / inch_x000D_ _x000D_ Rail shaft diameter: 12mm / 0.47inch _x000D_ Block size: 39 x 40mm / 1.54 x 1.57in_x000D_ Weight: 3706g _x000D_ _x000D_ _x000D_ Package Included: _x000D_ 2 x Linear Slide Rail Shaft _x000D_ 4 x Bearing Slide Block