The internal square pile holders are made from 3" x 3" x 1/4" angle and have four 6" rollers included. The pile holder is hot-dipped galvanized after fabrication. We make two versions of this guide which are a solid styleand a removeable side option as seen under related products. The roller assemblies are attached to the bracket with 1-1/2" x 1/2" carriage bolts which allow for easy replacement if needed. 

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