Features 1、These precision tools are suitable for checking location, hole size, gage slots, distance between holes, go & no-go gage, setting other gage and calibrating micrometers. 2、Each set supplied with a storage case and every steel pin marked with corresponding size on the case for easy identification. 3、Made of high quality bearing steel, strong and durable. 4、Overall heat treatment for higher hardness and strength. 5、Precision +/-0.0002 inch for more accurate measurement. Specification Features: These precision tools are suitable for checking location, hole size, gage slots, distance between holes, go & no-go gage, setting other gage and calibrating micrometers. Each set supplied with a storage case and every steel pin marked with corresponding size on the case for easy identification. Made of high quality bearing steel, strong and durable. Overall heat treatment for higher hardness and strength. Precision +/-0.0002 inch for more accurate measurement. Specification: Material: Bearing steel GCr15 Measuring Range: 0.011-0.060 inch Precision: ±0.0002 inch Package List: Package List