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Hi there! Thank you for your inquiry about the Peerless RP5389 bonnet nut. Unfortunately, we don’t have the information regarding the dimensions of this bonnet. However, it is used for the Peerless 3120 two-handle lavatory faucet series. For further assistance, you may send us the make and model number of your faucet at support@plumbersstock.com so we can help you find the bonnet nut that you need. Thank you for visiting PlumbersStock. Have a great day!