Build Custom Divided Light Windows & Doors With Our Matching 2-Pc. Router Bit Sets Being able to rebuild windows or interior French doors without having to go to the salvage yard is very worthwhile. Our 2-Pc. Window Sash router bit sets are designed to mill sash parts that offer traditional beauty and function. But these sets do much more; they also produce perfectly matched rail and stile parts for custom-built French doors in material up to 1-5/8" thick. Choose item #55-801 for 1-3/8" to 1-5/8" thick sash parts and item #55-802 for sash parts from 1-1/8" to 1-1/4" thick. Please watch our videos and read the detailed blog post which show the entire process as we ran it in our shop. There is also a nice WOOD Magazine article which serves as a very detailed instruction sheet. Item 55-801: For making thicker sashes of 1-3/8" to 1-5/8" thick  Item 55-802: For making thinner sashes between 1-1/8" and 1-1/4" thick