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A: Hi Wayne. The opening size is 3 1/8 in. x 3 1/8 in and the outside diameter footprint is 5 3/4 in. x 5 3/4 in.
A: Yep, $22 for one base. This system is pretty pricey but ended up being a pretty quality system.
A: Hi John. It has not been tested by EZ Handrail and I am not personally familiar with the Stanford post. Thank you for your question. Dan H. (EZ Handrail Dev. Team)
A: EZ Handrail does not contain any plastic parts. Dan H. (EZ Handrail Dev. Team)