Rear Binding Post - Brass - 820 - Assembly Includes (1) Brass Rear Binder .375" (3/8") X .400" Long, (2) Black Nylon Shoulder Washers, (2) #8 Brass Flat Washers, And (1) 8-32 X 1/2" Brass Phillips Pan Head Screw. Can Be Mounted In Both A Horizontal Or Vertical Or Horizontal Position.