Feature: Aluminum Alloy with Anodized Surface - CNC machined, made of aluminum alloy, durable to use. Accurate Calibration - Accurate calibration and laser-printed scale, precise and easy to read. Extension Length Design - Use the T-track connector to combine lengths of T-tracks. Can extend to longer capacity of T-tracks. Adjustable Limit Stop- The position of limit stop can be adjusted at will, parallel track, limit stop. Widely Application - Suitable for different guide rails. Specifications: Material: aluminum alloy Color: red rail length: 600mm Package Included: 1 x Guide Rail(195-795mm) 1 x Guide Rail(796-1396mm) 1 x T-track Connector 2 x Limit stop 2 x Wrench