Premium Quality: Made of premium stainless steel, this measuring instrument is sturdy, aging resistant and abrasion resistant to ensure maximum strength and durability for long time use Best Angle Checking Tool: The stainless steel thread gauge is useful for checking tool angle when cutting threads in metal lathes. Used to measure the pitch of thread and external thread, a great measuring tool for your work Adjusted freely: The thread measurer uses a rotary switch, which can be adjusted freely. Mini and compact in size, the stepping gauge doesnt take up too much space, easily carry it around with comfort Accurate measurement: the thread measurer comes with accurate measurements and simple design, which can be widely used and durable. Measuring Range: 0.25 - 6.00mm / 0.0098 - 0.23 Magnetic Head: The thread plug gauge, by quenching, high hardness, head with magnet. Narrow sheets designed to measure external and internal threads, even in small holes