Adjustable tongue mount roller. Complete fits 3" Wide Tongue. Will fit 3" and 4" tall tongues These durable, adjustable offset brackets mount on the trailer tongue with a 5" black rubber roller for additional keel support. The offset is 1", and length of the bracket is 11-1/2". Mounts with 3/8" diameter bolts (Included) and has a 5/8" diameter shaft for roller.