New oval design! Motorcycle & scooter locks for high risk areas. 14mm hardened MAX-Performance steel shackle resists cutting and leverage attacks. The Kryptonite Evolution Series 4 Disc Lock has double deadbolt locking mechanism for extensive holding power. New higher security, disc-style cylinder with more than a million key variations. Reinforced anti-drill/pull cylinder protection system. Sliding dust cover protects and extends cylinder life.