Attach wood fence rails to metal fence posts, eliminating rotted and failed wood posts. PGT1C2Z-R to Post: Install 2 set screws (supplied) with 3/8" socket in pre-drilled holes. PGT1C2Z-R to Rails: Use Simpson Strong-Tie Strong-Drive 1/4" x 1-1/2" wood screws (SDS) (not supplied). Install on vertical pipes, offsetting corners to allow for the correct rail alignment. For 2" pipe (2-3/8" outside diameter) 12-gauge galvanized ZMAX coated steel.