- 44-piece thread checker for nuts and bolts set: 44 measuring devices to accurately determine nut and bolt sizes and thread pitches. Simply run the nut or bolt over the gauge and read the dimensions in seconds. Helps replace broken, loose, or old fasteners at home or in the garage. - Standard inch and metric sizes: 21 metric sizes: 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, M24x3.0. 23 inches: 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, 1-12. - Practical storage box with size guide: clear labels allow quick identification of nuts and bolts; foam keeps gauges securely in place for neat storage. Organize fasteners in the compartment box to prevent loss and misplacement. - Aluminum alloy construction: durable aluminum alloy for long service life. Includes a complete selection of 44 nut and bolt size gauges for measuring thread pitch. Removable gauges enable easy checking, identification, and verification of fastener size. - Use scenarios: identify and replace worn fasteners on appliances or furniture; measure fasteners during automotive, bike, or equipment maintenance; quickly source correct bolts and nuts while assembling or repairing equipment.