The AI-000500 is a heavy-duty grounding cable that uses Mueller's BU-21C solid copper clips. Constructed with stainless-steel wire rope. For insulated version, see AI-000500-36.
The AI-000503E is a heavy-duty grounding cable that uses Mueller's BU-123 C-clamp and BU-21CEZ "EZ Squeeze" clip. Constructed with a stainless-steel wire rope.
The BU-21CEZ is Mueller's "EZ Squeeze" version of the BU-21. Uses mechanical action to reduce the force needed to open jaws by up to 75%, making this clip easy to use for long periods by anyone.
