Bike It Motorcycle Magnetic Oil Cleaning Bolt The Bike It motorcycle magnetic oil cleaning bolt is useful for helping prevent shavings in your engine. As the motor oil runs through the filter, the magnets pull all the metal particles out of the oil. This is a great solution because it prevents the shavings from running through the motor again. Pro Paint Motorcycle Paint Features: Anodised Aluminium. Magnetic. 10 - 12 mm. 1.25 - 1.5 Pitch.