There's a plastic bushing that prevents this.
About 1.5 inches
Hello bitrider and thank you for your interest in Moen products. The Moen Preston Towel Ring in Spot Resist Brushed Nickel mounts to the mounting hardware with a set screw, however the ring itself does not have a screw that secures ring to the base. The product does carry the Moen Limited Lifetime Warranty. If you have additional questions, please feel free to call us at 800-289-6636. Our current business hours are Monday through Friday from 8:00 am - 7:00 pm (Eastern Time).
Hello Sam and thank you for your interest in Moen products. The Moen Decorator series bath accessories line offers the chrome and polished brass, two tone finish option. The MOEN Decorator Towel Ring in Chrome and Polished Brass, model number YB4786CP, can be viewed on this website: http://www.homedepot.com/p/MOEN-Decorator-Towel-Ring-in-Chrome-and-Polished-Brass-YB4786CP/202044398?keyword=yb4786cp Please feel free to contact us prior to purchase for recommendations best suited for your project. We would be able to verify kits needed for your project and make product recommendations best suited for your situation. Don't hesitate to call us at 1-800-289-6636 or visit the "Contact Us" tab on www.moen.com to send us an email. Our business hours are 8:00 am – 7:00 pm Monday through Friday and 9:00 am – 3:00 pm on Saturday EST. We are here to provide support and ensure you will be satisfied with your Moen product.