It uses a 5.5mm Hardened Steel locking Bolt. This Abus Motorcycle Disc Lock is manufactured in an Impact Resistant Solid Cast Metal Body with a Mirror finish surface. The Colour is in Abus Luxus Gold. This motorcycle Disc Lock is designed to be very compact and easy to use with its one handed push button locking cylinder. An Abus Handy Disc Lock Bag and 2 keys are included.