The discs' inner and outer edges ride on inside balls, allowing the wheels to revolve. Skateboard hardware consists of the nuts, bolts, and screws that hold trucks to the board. The trucks are the lengthy metal shafts on the board's bottom that connect the wheels to the deck (the wooden platform you stand on). Each foot should be placed over the bolts on the top of the board that hold the trucks in place. Don't allow your feet stretch too far apart or come together in an overly tight posture.