This is KILLARK MOLBD-6-WR type LBD aluminum mogul conduit fitting. For use with steel or aluminum conduit. Comes with built-in cable-pulling rollers.   Equivalent to Thomas & Betts Red-Dot MALB-6. Copper-free aluminum. Raised dome cover for addition room. 

 I also have other sizes in my store.  Check my feedback and buy with confidence.  We have been in business for 20+ years.  As with all my listings, your satisfaction is guaranteed.  I can ship same day ups if the order is received before 3:00 pm central.  Check my store for more fittings or contact me for items not listed.