Stainless Steel Deck-Mount Adjustable Fishing Rod Holder:

Material: Polished marine grade 316 stainless steel Easily mounts to deck with permanent base plate.
Fully adjustable to lock-in desired fishing angle in 3-D The daimeter of The holder is: 1-5/8"
The length of the holder is: 6"
The mounting base is: 2" wide x 3.5" long

Type 316 stainless steel has the best corrosion resistance among standard stainless steels. It resists pitting and corrosion by most chemicals, and is particular resistant to saltwater corrosion. Marine parts construct of 316 stainless steel outlives those built of other materials, especially in warmer tropical waters, where saltwater corrosion is a formidable adversary