Our Adjustable Internal Pile Guide was designed to be used with our wood dock systems where you need to have a piling mounted internally within the dock system. This pile guide can expand or contract from 9-3/4” to 18-1/2” to cover a wide range of pile shapes, sizes, and materials. This gives you the ability to fine tune your internal pile guides to the exact size you need. This unit can even be used in areas where you may need a rectangular pile holder because it doesn't need to be set to an even square. The roller assembly that it uses is our H-RA4 flat style roller assembly.