Marine Grade Stainless Single Ring Cup Drink Holder - with base Single Stainless Drink Holder with base is solid marine-grade 316 stainless. Double drink holders are designed to fit Koozies, cans, mugs and large cups up to 3” in diameter. The elegant design also features an open frame to accommodate coffee cup handles. The drink holders sit 2-1/2” high, 4-3/8" long and 3-3/8" wide when installed and are highly polished.