Tired of pulling your nets up and rubbing against you boat railing- wearing down your line?? This is a gunnel mounted railing roller which makes the pulling so much easier and saves your boat and equipment! I've used mine(I build them) for years ....makes the task of pulling quicker too! Attach to your boats inside railing by bolt and wing nut(on and off quick) or simply use 2 C clamps to hold it in place!