You are bidding on a Vintage Mac MB520 10 Drawer Roll Cab 2 Piece Locking Swivel Casters Model MBC2-SWC with the original nuts for the bolts.  It does not include the bolts because they were welded to the frame. Please see picture number 4 for the size of mounting plate and distance between holes.  Wheels measure 4'' across.  Units  includes the original 8 nuts fasteners to secure on your box. May have cosmetic blemishes like dirty, wear, scratches, dents, damage from age or use but in good working condition. Unit is being Sold As Is With No Warranty or Guarantee. Buyer is responsible for any return shipping costs. Unit was removed from a Vintage Mac MB520  10 Drawer Roll Cab but may fit other models.  The last picture is the roll cab it was removed from. This package will be Shipped Priority Mail for Super Fast Delivery.  Please examine pictures for these are an example of the exact items you will be receiving.  Seller reserves the right to remove this listing at anytime because the items may be listed on multiple selling platforms. Thanks for shopping and have a great day.