The double bolt locking mechanism provides added strength and high pull resistance by locking tight to 2 sides of the bar the new used friendly pick pull and drill resistant onguard z key cylinder featuring bumpblok offers optimum deterrent against physical attack includes 4 laser cut keys 1 micro light and 4 extra grip keys micro light key projects a bright white beam micro light key projects a bright white beam massive 13mm ultra hardened steel shackle provides maximum cut resistanc