Interchangeable Core Key Gauge

This compact, convenient and easy to read interchangeable core key gauge is a great addition to any professional collection, particularly if you routinely work with A2, A3 and A4 systems. It's compact enough to carry around, but it's made from high quality stainless steel so that you don't have to worry about its durability. It measures just 3.75 inches by 2 inches, making it one of the most useful business card-sized tools you'll ever need.