They are Perko 448-2. I just bought a pair from Grady White and stamped right underneath it says just that. GW charged 189.00 per holder, a quick search on the internet shows them for about 119.00 without the GW stamped into them. In addition, the sticker on it about care states: "To maintain the original luster and brightness of exterior, chrome plated hardeware, Perko recommends periodic application of a protective metal polish to gaurd against corrosive atmospheres." It is chrome plated, not stainless which is why it cannot be buffed to new once the chrome plating has been worn or scratched...