Each gauge is clearly marked for convenient and easy reading. Used to check the pitch of the thread, a pitch, easy to use. - It is useful to check the tool angle when cutting threads on a metal lathe US standard: 1/14-inch & 1/20-inch, 1/24-inch & 1/32-inch, Metric type: 0., 5mm & 1mm. Stainless Steel Fishtail Twist Angle - Fishtail Angle and Marble Angle Thread Size Verification Tool Stainless Steel Fishtail Center Gauge Screw Thread Lathe Cutting Tool For Quick Comparison 55°& 60° Stainless Steel Screw Gauge Centre Gage 55°& 60° Screw Thread Measuring Tool Metric Specifications:Material: stainless steel US standard: 1/14-inch & 1/20-inch, 1/24-inch & 1/32-inchMetric type: 0., 5mm & 1mmPackage Includes:3x Screw Thread GaugeNote:Please allow 1-3cm error due to manual measurement. Each gauge is clearly marked for convenient and easy reading. Suitable for quick comparison of the thread angle of the workpiece. Extremely handy center gauges used for grinding and setting screw cutting tools. US standard: 1/14-inch & 1/20-inch, 1/24-inch & 1/32-inch, Metric type Extremely handy center gauges used for grinding and setting screw cutting tools. Small size and light weight,with simple design,can conveniently keep the in your pocket.