PORTABLE EASILY: There have small size and light weight while you can conveniently keep the fishtail center gauges in your pocket or tool bag. MAKING MATERIAL: The stainless steel center gauges are made of high quality stainless steel material while are to use. SCOPE OF APPLICATION: These high quality stainless steel fishtail center gauges are suitable for quick comparison of the thread angle of the workpiece. USE FOR: The thread pitch gauges that the materials are high quality stainless Steel are great used to measure the pitch of a screw thread. CLEAR SCALE: The scale of center gauges is clearly marked for convenient and these gauge tools are easy to read when using.