ZOBGOWE 2.5 Inches Chain Link Fence Post Base with Expansion Bolts and Screws Material: Carbon Steel Type: Black powder finished Inner Diameter: 2.5" Fit: OD 2.5" flange rod The round post brackets are made of carbon steel with a black powder finished for long-lasting service. The chain link fence post base, suit for outdoor and indoor. Such as fence post, deck post, flag pole, lamp post, mailbox post, railing deck. Both for wood and concrete floor. Each round post base bracket with the pre-drilled screw holes, easy to install. Warm Notice: Please allow a little error for manual measurement.