Features: - Nut and Bolt Thread Checker: It is a must-have tool set to sort nuts and bolts and helps keep tools well organized to simplify your work. - 44 Sizes: 23 imperial sizes and 21 metric sizes. 23 imperial sizes include 6-32, 6-40, 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, 9/16-12, 9/16-18, 5/8-11, 5/8-18, 3/4-10, 3/4-16, 1-8 and 1-12. There are 21 metric sizes, including M3x0.5, M4x0.7, M5x0.8, M6x1.0, M7x1.0, M8x1.0, M8x1.25, M10x1.0, M10x1.25, M10x1.5, M12x1.25, M12x1.5, M12x1.75, M14x1.5, M14x2.0, M16x1.5, M16x2.0, M20x1.5, M20x2.5, M24x2.0 and M24x3.0. - Easy to Use: The foam in the box and the tools themselves are printed with sizes, making it easier to use. - Upgraded Design: With cutouts on the foam, the thread checker can be kept in place firmly for easy access. - Time-Saving Tool: It can help users to check the sizes of nuts and bolts quickly. - Durable to Use: Made of carefully selected materials, the bolt and nut identifier gauge can last for a long time. - Easy Carrying: Waterproof and wear-resistant PVC box makes it more convenient to store and carry. - Widely Used: It is a practical tool for handymen, mechanics and users who need to figure out the sizes of bolt and nuts in a short time. Specifications: - Material: Aluminum - Surface treatment: High temperature nickel based treatment - Strength grade: Level 10 Package Included: - 44 x Thread Checker Tools - 1 x Carry Box - 1 x Size Chart