Rubber Stopper Wine, Beer, Pop Bottle Size These are perfect in Colavita wine vinegar bottles. 3 Rubber stoppers with feeding tube for bottle type hummingbird feeder. 15/16 inches in diameter at widest, 3/4 inches at smaller end, 1 inch tall. in metric 2.3 cm at widest, 1.9 cm at smallest, 2.4cm tall. I drill & make these myself. Need more than one set, contact me. 3 Hummingbird Feeder Stopper Cork Tube Wine Beer Size #3