The ISC 50 ft. (15 m) Heavy Duty Fall Arrest Block has a cast Aluminum housing, making it suitable for heavy-duty use, even in harsh environmental conditions. The ISC 50 ft. (15 m) Heavy Duty Wire Recovery Fall Arrest Block is fitted with a Twistlock Fall-indicating, Swivel-eye Karabiner, which also has a load-indicator. In the event of a fall, the swivel eye will pull out a short way, exposing a red collar.

All ISC Blocks have solid Aluminum Housings proven to last all sorts of environments, from rental to off-shore. The internal mechanisms are simple, making them easily serviceable.