The most accurate door gap gauge on the market. Contains 5 separate blades (1/16" and 1/8") that can be used together to create various dimensions up to 1/2". The end cap is 3/4" thick to accurately measure undercut compliance and 3/8” wide. Notches on blades measure 1", 1-1/8", 1-3/8" and 1-1/2". Using the blades and end cap dimensions, you can quickly and easily gauge compatibility with common door gap solution products.