SPECIFICATIONS: One nut and screw thread checker of the same size for each size, 26 external and internal thread gauges, 14 and 12 metric gauges.EASY TO USE: simply screw the nut or bolt onto the thread gauge. It only takes a few seconds to check the dimensions. With the Giwaelro standard and metric thread checker you can easily and quickly check the correct size of nuts and bolts at home or in your garage and replace broken, loose, rusty or old nuts and bolts.HIGH QUALITY ZINC MATERIAL: This thread checker is made of high quality zinc material. It is durable, rust-proof and has a long service life. It is a practical construction tool for workers.ACCURATE MEASUREMENTS: Upgraded double-sided print size. The imperial and metric thread checker is an accurate and easy to use thread identifier for nuts and screws. The thread checker is particularly suitable for distinguishing between similar imperial and metric threads.26 SIZES: Silver includes part numbers for 14 sizes: 6-32, 8-32, 10-24, 10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, 1/2-20. Black includes 12 metric sizes Part numbers: M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.5, M12x1.25, M12x1.5, M12x1.75.26 Male Female Thread Identification Tool26 SIZES: Silver includes part numbers for 14" sizes: 6-32, 8-32, 10-24, 10-32, 1/4-20, 1/4-28, 5/16-18, 5/16-24, 3/8-16, 3/8-24, 7/16-14, 7/16-20, 1/2-13, 1/2-20. Black includes 12 metric sizes Part numbers: M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.5, M12x1.25, M12x1.5, M12x1.75.HIGH QUALITY ZINC MATERIAL: This thread checker is made of high quality zinc material. It is durable, rust-proof and has a long service life.ACCURATE MEASUREMENTS: Upgraded double-sided print size. The imperial and metric thread checker is an accurate and easy to use thread identifier for nuts and screws.Specification:Item Type: Nut and Screwbolt Thread CheckerMaterial: ZincGross Weight: 317g / 11.2ozSPECIFICATIONS: One nut and screw thread checker of the same size for each size, 26 external and internal thread gauges, 14" and 12 metric gauges.Package Included: 26 Male Female Thread Identification Tool