This 18" aluminum metal handrail/safety grab bar is great for all types of outdoor marine or pool applications. You can use it on your boat, dock, hot tub, pool and anywhere else you want a little extra support. This handrail is made soley by Marine Fiberglass Direct and they uses two 3-1/2" base plates that will fit on a 2x4 with no overlapping. There are three anchor points on each pad. You can use stainless screws or stainless bolts for any type of application. You can use it around fresh water or salt water applications. This handrail is designed to help with safety. It allows safe and easy access to and from a boat or dock, making it perfect for all marinas, private docks, hot tubs, pools, fueling stations and many more places. For those concerned with aesthetics, we offer this product powder coated white Specs: Quantity: One 18" handrail High quality 6063-T5 Mill finish aluminum Approximate height 18” +/- 1 ½" diameter tube Approximate center-line width: 11.5”, Outside approximate width: 13". Total approximate outside width of the bottom pads: 14-3/4". Base: 3 ½ “ 3 anchor - polished base plate ¼” thick This handrail is produced by Marine Fiberglass Direct and is proudly made in the USA.