OMI Roto-Molded Dock Box Locking Set with Two locks and Two matching keys Need accessories? We have them too. OMI’s dock boxes are constructed of rotationalmolded polyethylene giving it much more durability and versatility than fiberglass dock boxes. Dock boxes are virtually indestructible. UVprotected polyethylene resists corrosion from fresh or salt water, fuel, oil, and the marine environment. Poly Dock Boxes come with a non-abrasive finish. Made in the USA. We have some unique accessories if you want to add them to your Dock Box. Two straight-locks with matching keys. One key for both locks. Rod holder is fastened to the top of the lid with stainless steel hardware and holds up to eight (8) fishing rods.