Block Gauge Set,0 /1 Grade,High Speed Steel ,Tools for Carpenter,Inspection and Measurement ,Durable Construction

The surface hardness is HRC 64 All block gauges are made of the high speed steel All gauge block sets are made to special standards to resist corrosion and defacement Manufactured under carefully controlled conditions allowing for the highest degree of accuracy when used at a temperature of 68 degrees F ( 20 degree C) We offer a variety of customized gauge block which is made of high speed steel, tungsten steel, and ceramics with an accuracy of 0.001mm.