Custom Rear Binding Post - Brass - Assembly Includes (1) Custom Rear Brass Binder .375" (3/8") Dia. X .500" (1/2") Long, (2) Black Nylon Shoulder Washers, (2) #8 Brass Flat Washers, (1) 8-32 X 1/2" Button Head Cap Screw. Can Be Mounted In Either A Vertical Or Horizontal Position.