Custom doors come in all sizes. 3" thick is a big door, and most door hardware manufacturers will not have anything available to fit something that thick. Often times we have customers that have doors just a bit larger than standard thickness [1 3/8" - 1 3/4"]. Most of the time customers that have thicker doors are in the 2 1/4" - 2 1/2" thickness range. Luckily Emtek brand hardware has a fit kit available for most of their products to accommodate these thicker doors. Sometimes we have customers with a door even thicker. Just now I had a call from a customer who had been searching for weeks trying to find a deadbolt for his 3" thick door. While most all Emtek brand hardware will accommodate doors that are thicker than standard, only a few will accommodate doors 3"" thick. Check out the Emtek Brass Series Deadbolts, Door knobs and lever handles for options. Once you choose as style you like, you can choose door thickness options from the pull down menu before adding the items to your cart. Have a 3" thick door yourself? give us a call and we can show you what is available. Have a door that is thicker than 3 Inches? Well, your options are pretty limited. You may even have to have something custom made.