The Dexter 5 on 4.5" Bolt Pattern Standard Grease Idler Hub Kit is the perfect solution for your trailer needs. This hub kit is made from high carbon alloy for maximum durability and is maintenance free, greased for life. It is also coated with different materials to protect it from corrosion and rust. This hub kit is designed to fit a 4.5" bolt pattern and has a stud size of 1/2". FleetPride is your First Click in Heavy Duty®.