Specification Brand : ZIZEV BulletPoint1 : Steel: Made of steel with high hardness, wear resistance, and resistance for use. BulletPoint2 : Included With a sorting box that clear and for bolt labels, black for metric and for imperial, these thread provide easy and quick identification and use. BulletPoint3 : Steel: These thread size identifiers are made of steel, with high hardness, wear resistance, resistance, and a long service life. BulletPoint4 : Wide Applications: These thread have sizes to for ensure accurate identification, suitable for plumbers, repairmen, automotive mechanics, etc. BulletPoint5 : Detailed for bolt And Size Gauge: Not only equipped with a thread size measurement tool, but also a detailed for bolt and identification gauge to help you accurately locate the size and of the for bolt or . Color : Metric 60 Degrees 20pc ExternallyAssignedProductIdentifier : 7626936114777 ExternallyAssignedProductIdentifier1 : 7626930277706 ExternallyAssignedProductIdentifier2 : 7626937002233 ItemName : 21Pcs Thread Checker Set for Bolt Gauges Size Threaded Hole Thread Gauge Size Identifier Thread ItemPackageDimensions_Height : 6 centimeters ItemPackageDimensions_Length : 30 centimeters ItemPackageDimensions_Width : 20 centimeters ItemTypeKeyword : thread-gauges Manufacturer : ZIZEV Material : Stainless steel 203 ModelName : EVTSCANxbap2smioc ModelNumber : ZIZEVdv7hg3qcym PartNumber : ZIZEVdv7hg3qcym ProductDescription : 1. Multi Specifications: This kit includes 44 pieces thread gauges, 23 imperial and 21 metric specifications, for nut and bolt thread inspection and identification. 2. For Narrow Spaces: These thread checkers have compact structure, can be used to measure threads in narrow or enclosed spaces, convenient and practical. 3. Carbon Steel: These thread size identifiers are made of excellent carbon steel, with high hardness, wear resistance, impact resistance, and has a long service life. 4. With Storage Box: This kit includes a sorting box with clear nut and bolt labels, black for metric and silver for imperial, for convenient and quick identification and use. 5. Wide Applications: These thread checkers have standard sizes to ensure accurate identification, suitable for plumbers, repairmen, automotive mechanics, etc.