1. These tools are suitable for checking location, hole size and depth, gage slots, distance between holes, etc.2. Come with a wooden case to keep these pin gage neatly organized and easy to find.3. Each pin gage is labeled with corresponding size for easy identification.4. Made of bearing steel, strong and durable.5. Overall heat treatment, high hardness up to 58-63HRC.Specification:Features: These tools are suitable for checking location, hole size and depth, gage slots, distance between holes, etc. Come with a wooden case to keep these pin gage neatly organized and easy to find. Each pin gage is labeled with corresponding size for easy identification. Made of bearing steel, strong and durable. Overall heat treatment, high hardness up to 58-63HRC.Specification: Item Type: Pin Gage SetMaterial: GCR15 bearing steelLength: 50mmAccuracy: +/- 0.001mmHardness: 58-63HRCRange: 0.5-0.99mm, interval 0.01mm, 50pcs in total Package List:50 x Pin Gage 1 x Wooden Box