Economy Pin Gage Set, MINUS Specifications include... 0.501" - 0.625" Range -0.0002", +0 Includes 125 pins Features include... Centerless finish with 10 micro finish or better. Inspected to tolerance (+0.0000", -0.0002"). Increments of 0.001". All sharp corners broken. Heat treated to a hardness of 60/62 RC. Gage Range .501 - .625 (125 Pieces)