Replacement Caps for Stan Pac & Libbey Glass Milk Bottle (4, 48mm) BPA-free Plastic Snap Cap Lids for Stan-Pac and Libbey Bottles 38MM Lids fit bottles that measure approx 1-1/2" dia at the top 48MM Lids fit bottles that measure approx 1-3/4" dia at the top- these are the most common 56MM lids fit most old bottles and decorative bottles with a large top