Porcelain Handles, Porcelain Knobs, Replacement Porcelain Faucet Handles, 12 Spline Connection - By PlumbUSA Porcelain parts only for replacing broken or missing faucet or shower handles Index buttons, screws and bell-shape flange are NOT included. 12-spline broach to connect to bell-flanges. Please check your original design to buy the right parts. Knob is about 3-inch diameter.