They are fast, accurate, easy to read and have a balanced design for easy one hand operation. The gage can be pressed down on a flat surface and checked so the size should read the same as the set number stamped on the back of the indicator. It can also be checked and set with an optional Òsetting masterÓ. FEATURES  All ground surfaces are of hardened tool steel  AGD design  Fast, accurate and easy to read  Balanced design for easy one hand operation  Can be checked and set with an optional setting master  Gage can be pressed down on a flat surface and checked so the size should read the same as the set number stamped on the back of the indicator  Holes that need to be accurately checked must have no chamfers or countersinks SPECIFICATIONS  Made in America: Yes  Type: Hole Gage  Range (in): .030 - .130  Graduations (in): .001"