World Pride&reg; Universal Cookware Pot Lid Cover Handle Knob Replacement, Set of 2pcs Durable and practical accessory, fit for most pot covers Made of stainless steel Knob diameter: 5.7cm (max outer edge) Screw diameter: 4.5mm ; Gasket diameter: 15mm Note: The best hole size (diameter) for the pot lid is between 5mm to 10mm