Description: Sturdy Material: Bolt Size and Thread Gauge is made of aluminum alloy material, high hardness, sturdy. Suitable for plumbers, handymen, repairsmen, auto mechanics, machinistsQuick Identification: Our nuts bolt organizer for everyday use, which can help you quickly sort out your assorted nuts and bolts and get them well organized, quickly check nuts and bolts in inch or metric and verify the size and thread pitchNut And Bolt Thread Checker: 44 Pieces Nut and Bolt Thread Checker with storage box, 44 male/female gauges, red gauges are metric (21pcs), and blue gauges are inches (23pcs)23 Various INCH SIZES(Blue): 1-12, 1-8, 3/4-16, 3/4-10, 5/8-18, 5/8-11, 9/16-18, 9/16-12, 1/2-20, 1/2-13, 7/16-20, 7/16-14, 3/8-24, 3/8-16, 5/16-24, 5/16- 18, 1/4-28, 1/4-20, 10-32, 10-24, 8-32, 6-40, 6-3221 Various METRIC SIZES(Red): M3-0.5, M4-0.7, M5-0.8, M6- 1.0, M7-1.0, M8-1.0, M8-1.25, M10-1.0, M10-1.25, M10-1.5, M12-1.25, M12-1.5, M12-1.75, M14-1.5, M14-2.0, M16-1.5, M16-2.0, M20-1.5, M20-2.5, M24-2.0, M24-3.0 Specification: Material: Aluminum Alloy Size Chart: Multi Package Includes: 44x Nut and Bolt Thread Checker Note: Please allow slightly errors due to manual measurement and different monitors.