At BCF we've got everything you'll need for your trailer. The Ark Rubber Cotton Reel roller is a 4 1/2-inch (112.5mm) brushed black rubber bilge roller with a 17mm bore. At 115mm long overall and with its flaired ends (cotton reel), it's perfect for trailers pulling a tinny or smaller fibreglass boats. Having your rollers working properly, and at the correct height, will not only make life easier when launching and retrieving, but also protect your investment. With the range of rollers available at BCF you're sure to find exactly what you need no matter what size, or style of boat you have.