ABUS 83/45 is made of solid brass that provides extra resistance in corrosive and salty environments. The special alloy steel shackle has a Nano protect coating which also offers extra corrosion protection. The dual ball bearing locking mechanism resists pulling and prying giving it added security levels. The 83 series can be keyed into many popular security keyways with a cylinder that can be taken out and re-keyed to match most existing keys. The 83/45 series also has the patented shackle change feature, allowing the user to change out shackles in seconds. with ABUS patented Z-bar it converts key retaining to non-key-retaining within seconds.