The standard rigid metal flap track gauge can give false readings because it doesn’t stay perfectly square in the slot. Our EZ Flap Track Tool solves that problem with a flexible design. Made from tough, high-strength plastic, it flexes just enough so the round .6035" gauge head automatically stays (perpendicular) to the flap track surface. You get a true go/no-go wear check every time — exactly as the service manual intends.