The Little Giant screw cap for calf bottle is a durable plastic screw on cap designed to securely hold a calf nipple in place on a standard nursing bottle It is compatible with the Little Giant screw on calf nipple and features threads that fit both the Little Giant two quart and three quart nursing bottles Each cap measures two point five inches in diameter and zero point six two five inches in height making it a reliable and properly sized solution for feeding calves efficiently