The EZ Gate Trailer Gate Assist Reduces lifting by 90% which also reduces the chance of injury and fatigue. Works on open utility trailers with a side rail height of 10″ or more and with gates up to 180 lbs. It also features a no rattle spring insert and a black powder coat finish. All mounting hardware and easy to follow instructions are included. The housing tube is 6 ong and has a 2-1/4″ diameter. NOTE: Trailers need to be at least 8 n length