Glass Lid Pyrex Pot Pan Pan Glass Lid 28 cm Will Be Sent Without Top. There are bumps on the edges of the lid to prevent the food from overflowing and to allow the steam to escape easily. It is not damaged. For Correct Measurement You need to measure your pot from inside to inside. For example, if the measurement from inside to inside is 29.5cm, you need to buy a 30cm cover.