This registration tube from Biltwell is an inexpensive, old school solution to an age-old problem. Where to stash your paperwork on a bike that doesn‘t exactly have a glove box. The Biltwell registration tube is easy to use. Simply loosen one thumb screw, remove the end cap, slip your documents into the plastic tube, replace the end cap and bolt the entire assembly to the license plate. Consists of a high-impact plastic tube (Ø = 30 mm), machined aluminum end caps, stamped steel L-brackets and black electroplated wing nuts and brackets.