Please note: There may be slight color difference or discrepancy in the actual product, which does not affect the use, please don't mind, thank you! [50Pcs Detachable Set]Our nut and bolt thread checkers include 27 SAE standard and 23 metric thread gauges. is inserted into a box storage rack, allowing you to easily take out the checker to identify thread sizes in any space. Compared with traditional check plates, it is more flexible and convenient. [Aluminum And Laser Engraving]Our standard and metric sets are made of high-quality aluminum alloy. The text on the of each nut and bolt is processed by laser engraving technology, which is clear and easy to read, as well as . [27 Standard Thread Sizes (Blue)]Our nut and bolt thread checkers include the following specifications:2-56 UNC, 4-40 UNC, 6-32 UNC, 8-32 UNC, 10-24 UNC, 10-32 UNF, 12-24 UNC, 1/4-20 UNC, 1/4-28 UNF, 5/16-18 UNC, 5/16-24 UNF, 3/8-16 UNC, 3/8-24 UNF, 7/16-14 UNC, 7/16-20 UNF, 1/2-13 UNC, 1/2-20 UNF, 9/16-12 UNC, 9/16-18 UNF, 5/8-11 UNC, 5/8-18 UNF, 3/4-10 UNC, 3/4-16 UNF, 7/8-9 UNC, 7/8-14 UNF, 1-8 UNC, 1-12 UNF. [23 Metric Thread Sizes (Red)]Our nut and bolt thread checkers include the following specifications: M2X0.4 Coarse, M2.5X0.45 Coarse, M3x0.5 Coarse, M4x0.7 Coarse, M5x0.8 Coarse, M6x1.0 Coarse, M7x1.0 Coarse, M8x1.0 Fine, M8x1.25 Coarse, M10x1.0 Fine, M10x1.25 Fine, M10x1.5 Coarse, M12x1.25 Fine, M12x1.5 Fine, M12x1.75 Coarse, M14x1.5 Fine, M14x2.0 Coarse, M16x1.5 Fine, M16x2.0 Coarse, M18x1.5 Fine, M18x2.5 Coarse, M20x1.5 Fine, M20x2.5 Coarse. Color: As Shown Material: Aluminum Alloy Package Contents: 1 * 50Pcs Detachable Set 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.