Brass Rear Binding Post Assembly - Can Be Mounted Both Horizontal Or Vertically. Assembly Includes: (1) Brass Binding Post .312" (5/16") Dia. X .625" (5/8") Long Tapped For 8-32 Threads, (1) 8-32 X 1/2" Button Head Cap Screw, (2) Black Nylon Shoulder Washers, And (2) #8 Steel Flat Washers