The Vintage Lufkin 1/64 Radius Gauge is a precision inspection tool used in metalworking for measuring the radius of curved surfaces. Made by the well-known brand Lufkin, this gauge is a reliable choice for ensuring accuracy in CNC machining and manufacturing processes. With its detailed measurements and durable construction, this radius gauge is an essential tool for professionals in the industrial and manufacturing sectors. I do not know anything about these tools. Just acquired. I ship once a week on Saturday.