Feature:1. Block gauge means a tool for testing the length of a tool or workpiece.2. It is a rectangular metal block with extremely precise thickness.3. Made of high quality steel, which is strong, solid and durable.4. 81pcs gauge blocks in different size, can meet different using needs.5. 100% brand new and high quality.Specification:Condition: 100% Brand NewItem Type: Gauge BlocksMaterial: Tool steelNominal size series:0.1001, 0.1002-0.1009 (inch) total 9 pieces, interval 0.0001 (mm)0.101, 0.102-0.149 (inch) total 49 pieces, interval 0.001 (mm)0.050, 0.100-0.950 (inch) total 19 pieces, interval 0.50 (mm)1.000, 2.000, 3.000, 4.000 (inch) total 4 blocks, interval 1.000 (mm)Usage: measuringPackage list:81 * Gauge BlocksNotice:1. Please allow slight error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.