25 PACK-White-6X6 FENCE POST PLASTIC CAP-(5 5/8 X 5 5/8) Pressure Treated Wood Made In USA Fence Post Plastic White Caps 6X6 Cap should be pre-drilled if you are going to secure with a nail. EXACT INSIDE DIMENSION OF THIS CAP IS (5 5/8" X 5 5/8") MADE IN THE U.S.A. Free Shipping