The Tilt Deck Axle is a custom piece of hardware by Tilt. The customer washer under the head of the bolt allows more torque to keep your setup dialed, and the custom length makes sure your deck and wheel are riding on the sold part of the axle, not the threaded. Compatible with the following Tilt Pro Scooter Decks: Deck (M8 x 54.0mm Length): Theory, Theory 002, Ten Year, Theory 3, Stage I, Formula