ABUS padlocks are available in many versions and can also resist difficult conditions (e.g. corrosion resistance). The patented Z-bar allows the padlock to be easily converted from non-key retaining to key-retaining. Because of the patented "easy Shackle Change" feature it is possible to change the shackle within seconds.
Here you can find more information on the technical characteristics of the several padlocks of the 83 series.