A: 4"
A: Hi Betsy - Thanks for asking about the Threshold™ 18" Hennepin Hook Rack with Ledge - White/Satin Nickel. It can hold up to 35 lbs. - Julie
A: Hi RT- Great question. This hook is a great way to keep organized in your home. There are screws that are provided to secure it to your wall. Thanks for asking. -Michelle