This is a one hole copper compression lug.  It is for 500 MCM stranded copper and has a 1/2" hole.  It is equal to a burndy YA34L6.  I have many other sizes  available 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 3:30 pm central.  Check my store for more fittings or contact me for items not listed.