Our nut and bolt thread gauge kits are constructed from aluminum material for excellent corrosion resistance and . It undergoes quality control to precise thread dimensions. 26-piece nut and bolt includes 14-inch and 12-metric sizes. Each gauge is individually inserted into size-marked EVA foam and packed into a carrying case to better protect the individual tester from rust. You can measure a single screw or nut in any tight location. Each bolt and nut has a sturdy laser-printed label to easily help you identify different sizes. [12 Metric Red Aluminum Sizes]-M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.5, M12x1.25, M12x1. 5. M12x1.75 [14-inch blue aluminum size] - 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 Wide range of applications, whether you are a professional technician or an everyday user, our instrument clusters can meet all your needs. Suitable for automobile maintenance, mechanical engineering, home DIY and other fields. It can help you quickly and accurately detect the thread size of nuts and bolts and improve work efficiency. Stickers: random styles, don't accept the specified Colour:Photo Color Material:aluminum Package Contents: 26 x nut and bolt Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.