Barely used set of caster, 2 swivel and 2 ridge in each set of 4.  There are 1 set of red and 1 set of black casters.  Bolt hardware can be sent along as well, for free, simply ask before shipping.  Auction is for 1 set of 4 casters.  Ask all questions before bidding.  Looking for a quick sale.  Happy to check anything you want.