Hello there! Yes, this Kohler GP41398-CP Chrome Strainer Cup Assembly has a 3.5" diameter. Here is a picture that you can look at for your reference. Start placing an order by adding it to your cart and filling in the required fields. Should you have further questions, please let us know. We are eager to help you improve your home and are excited to be able to partner with you in all your plumbing needs. Please feel free to share your experiences as well. PlumbersStock has many outlets for consumers to share feedback including Facebook, Twitter, Instagram, and Pinterest. Your opinions matter to us. Thank you for visiting plumbersstock.com - the one-stop online shop for professionals and DIYers.