44PCS Nut and Bolt Thread Checker Carbon Steel Bolt Nut Identifier Gauge with Storage Box for Maintenance Repair 1COMPREHENSIVE SET: Our nut and bolt thread gauge kit includes 44 pieces of gauges for measuring nut and bolt sizes, allowing you to accurately measure thread pitches. 2STANDARD SAE AND METRIC SIZES: The nut and bolt thread measuring tool kit includes gauges for both SAE and metric threads. It is a complete set of measurement tools suitable for various professionals such as plumbers, maintenance workers, repair technicians, automotive mechanics, and engineers. 3MEASUREMENT IN TIGHT SPACES: Unlike wall mounted or fixed nut and bolt measuring devices, each of the gauges in our kit can be detached and used to measure thread pitches in narrow or confined spaces. 4HANDY SIZE GUIDE STORAGE BOX: Our organizing box features clear labels for easy and quick identification of nuts and bolts. The foam securely holds the gauges in place for tidy storage. The red gauges are for metric sizes, while the blue gauges are for SAE sizes. 544 PIECE THREAD GAUGE: The gauges included are the most commonly used sizes in daily tasks. They help you quickly organize various nuts and bolts and keep them neatly arranged in the compartment box, preventing misplacement and loss.