Features 1,FLEXIBLE AND DETACHABLE: Imperial and metric thread checkers are designed with detachable loops at both ends that you can open or close for use anywhere, providing more possibilities for space utilization. You can also select individual or parts to use, or take out common parts and use them in a single wire loop 2,MULTIPLE SIZES: The nut and bolt thread checker come with 44 male female gauges, including 23 imperial and 21 metric sizes, to suit all your nut and bolt inspection needs. The thread size is permanently printed on each gauge, easy to identify the correct size for your project 3,ROBUST STAINLESS STEEL CONSTRUCTION: The thread detector kit is made of robust stainless steel that can withstand frequent use and last for years. The stable construction ensure that each instrument is robust and reliable, making it a must have tool for any workshop or craft enthusiast 4,21 METRIC SIZE PART NUMBERS: M3‑0.5, M4‑0.7, M5‑0.8, M6‑1.0, M7‑1.0, M8‑1.0, M8‑1.25, M10‑1.0, M10‑1.25, M10‑1.5, M12‑1.25, M12‑1.5, M14‑1.5, M14‑2.0, 16‑1.5, 16‑2.0, M20‑1.5, M20‑2.5, M24‑2.0, M24‑3.0 5,23 IMPERIAL SIZE PART NUMBERS: 6‑32, 6‑40, 8‑32, 10‑24, 10‑32, 1 or 4‑20, 1 or 4‑28, 5 or 16‑18, 5 or 16‑24, 3 or 8‑16, 3 or 8‑24, 7 or 16‑14, 7 or 16‑20, 1 or 2‑13, 1 or 2‑20, 9 or 16‑12, 9 or 16‑18, 5 or 8‑11, 5 or 8‑18, 3 or 4‑10, 3 or 4‑16, 1‑8, 1‑12 6,TIME SAVING AND CONVENIENT: The nut and bolt thread checker is designed to increase your efficiency, save time and eliminate guesswork. With a separate meter that rotate freely on the cable, you can quickly verify thread sizes and complete projects faster Specification Item Type: Bolt Size Thread Gauge Specification: 44Pcs set 23 Imperial: 632, 640, 832, 1024, 1032, 1 or 420, 1 or 428, 5 or 1618, 5 or 1624, 3 or 816, 3 or 824, 7 or 1614, 7 or 1620, 1 or 213, 1 or 220, 9 or 1612, 9 or 1618, 5 or 811, 5 or 818, 3 or 410, 3 or 416, 18, 112 21 Metric: M30.5, M40.7, M50.8, M61.0, M71.0, M81.0, M81.25, M101.0, M101.25, M101.5, M121.25, M121.5, M141.5, M142.0, 161.5, 162.0, M201.5, M202.5, M242.0, M243.0 Package List 1 x Bolt Size Thread Gauge Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.