Matrial:Aluminum Alloy Easy to fit, great for storage and transportation. Can be mounted vertically or horizontally Fork block holds 1 bike in your truck bed or trailer.Works only on bikes with quick-release front wheels Fits bikes with both disc and standard brake systems 8-mm Quick-release skewer allows for rapid loading and unloading Simple bolt-on installation Attaches to truck-bed rail, toolbox, trailer bed or any solid surface Sturdy aluminum construction with black powder coat finish ensures durability and rust resistance