Patriot Docks Heavy Duty Pipe Holder The HD pipe holder is fastened to the aluminum dock frame with two 12 boltnut fasteners. The zinc oxide-coated steel bracket clamps to 1 12 sch 40 Pipe with two 12 bolts to support the dock frame. The inside diameter measures 2-116. The post sleeve is 12 long with frame connection bolts that are 8 apart.2-116 i.d. Patriot Dock components are modular to make it easy to customize the size and configuration for maximum versatility. We have prepared many dock pac