Seller: lbnyc123 (181) 100%, Location: Hampton Bays, New York, Ships to: US & many other countries, Item: 252510651435 Material: Brass, Maker: Ajax Hardware, Details: These are from an East Hampton estate. They are probably about 45-55 years old. Made by the Ajax Hardware Company in City of Industry,CA. They are heavy solid substantial pieces. The backplates have a tiny hole on the perimeter that is meant for a tack to help secure the plate. Dimensions of backplate (inches) 2 1/2 X 2 1/2 squares Tip to Corner is 3 inches Thickness...1/8 Diameter of screw hole in back plate...3/16 Flat area in the middle of the back plate is just under 7/8 The price is per item. Each item is a knob, backplate, a screw and a backplate tact. *backplate tact only with first 10 Note: Antique dealer is selling just the backplate for $50 and knobs for $75 each. This is $49 for a knob/backplate set.