[Nut & Bolt ] With 26 male/female gauges, included 14 inch & 12 metric sizes, our product is the ideal solution to all your nut and bolt checking needs. This nut and bolt has been upgraded to aluminum with red/blue oxide layer for each thread gauge, providing clearer size marks with anti-rust and anti-wear features that long-lasting visibility. [Blue Oxide Layer Aluminum for Inch Size] Includes 14 Inch size part numbers: 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. [Red Oxide Layer Aluminum for Metric Size] Includes 12 metric sizes part numbers: -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, -1.25, -1.5, -1.75. [Easy to Hang] Our nut and bolt gauge comes with a convenient hanging feature that allows you to hang it on a pegboard or tool rack for easy access., Manufacturer: Akfldms