Rear Binding Post - Brass - 826 - Assembly Includes: (1) Black Oxide Rear Binder .375" (3/8") Dia. X .500" (1/2")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 Position.