This is a 250 MCM split bolt for copper wire.  Burndy number KS29.  These are brand new, clean parts.  I have many other sizes  available in my store.   Check my feedback and buy with confidence.  You can pay with a credit card by calling 800-972-7715.  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.