This Vermont Gage 371188050 Go/No Go Set Plug Gauge is a measuring tool designed to gage parts directly or calibrate measuring equipment. It has a tool steel construction that provides an accurate reading with high resistance to wear and corrosion. The go/no-go gauge comes in plus/minus options, so you can use it for both regular and special applications. Its class 2A guarantees your part will meet all required tolerances. This plug gauge has an overall length of 1 5/8″ and thread size of 1 1/2″-12. This Vermont Gage 371188050 Go/No Go Set Plug Gauge ensures that your product meets the required specifications every time.