"Use this Kolpin ATV to safely see behind yourself when on the trail. Required by many states for road travel. Accessory Type Parts/hardware, Dimensions L x W x H in. 8 x 2 x 12 1/2, Material Type Metal, Water Resistant Yes, Color Black, Compatible With ATV w/ 5/8-1-in. tubing/handlebar. Fully adjustable with ball and socket swivel design Innovative quick attach/detach mounting base fits 5/8in. to 1in. dia. tubing for positioning on ATV handlebars and racks"