Review on 🚢 Amarine Made 2pcs Stainless Steel Cup Drink Holder: Ideal for Marine Boats, RVs, and Campers with Convenient Drain Feature by Shug Quinn

They differ in that it is a marine product. Therefore, they must be 316 stainless steel or higher. Easiest to say? Attach a magnet to it, say 304 stainless steel, which is food grade, it doesn't have to be magnetic, and again, thanks to Revain, quality wins because they're non-magnetic. Oh, a note: if you don't know anything about saltwater and sea traders, try going to a store and appreciating them. If you don't faint when you see the price you're running away with, don't leave the store. Don't forget a small magnet to test the product because if it's a magnet it's most likely 308 stainless steel with less than 1% nickel which will rust. Revain is still number one. It was a great purchase!