This bike carrier rack made of durable aluminum alloy, , resistant to heavy pressure, no problem for long distances. Frame-mounted for heavier top & side loads, carries up to 100kg max. With safety warning lightis, height and length are adjustable, applicable to 24-29inch bikes. Quick release mount at seat post, and screw fix to frame positioning. Double triangle load-bearing fixed structure so as to stable mount and loading. Specification: Material: Aluminum Alloy Colour: Black Size Chart: Size: 50x14cm/19.69x5.51inch Package Includes: 1 Piece Rear Rack : Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.