On Guard Locks U-Lock, Standard Double Team: * 13mm (0.51") hardened steel shackle * Patent pending "Z-cylinder" lock mechanism * Pick, pull and drill resistant cylinder * Includes 2 keys (1 with micro LED light) * Rotating dust cover * "DRC" Double Rubber Coating to protect you bikes finish * Quick Release all tube lock mounting bracket * Bonus double loop end cable included * 4" x 0.39" twisted steel cable * Tough vinyl cable coating * Velcro strap secure the cable during transporting and storage * 90-day limited warranty