Screw-on base combines with the Little Giant 1-Quart Screw-On Feeder/Waterer Jar (Item No. 690, sold separately) to make a gravity-feed waterer for baby chicks and small birds. 6 inch diameter by 1.5 inch high. Made of heavy-duty polystyrene Available in several colors to mix and match. Little Giant is a family brand of Miller Manufacturing Company.