More info:
http://bptfittings.com/Catalog/CatalogFamily.aspx?CategoryId=10&FamilyId=...
MIGHTY-RITE® Split-GROUNDING BUSHINGS
The MIGHTY-RITE Split Grounding Bushing can be installed before or after you pull wire and make connections. It's another contractor innovation from Bridgeport.
• Can be installed before wire pull, or after -- without expensive rework
•Adjustable grounding lug accepts wire easier
•Pulling larger conductor wire is easier when you can install grounding bushings after the pull
• Hinged design adjusts and aligns easier -- even in tight spots
• cULus listed available in ¾ to 4-inch trade sizes
•150˚C rated liner