Features 1,Quick Identification: Simply tighten the nut or bolt onto the thread checker to immediately measure the size. Quickly check if the sizes of nuts and bolts are correct, making it easy to replace damaged, loose, rusted, or worn parts. 2,Wide Size Inspection: Provides 2 screw thread inspectors, including 14 metric sizes and 14 standard sizes, to help you identify various standard and metric threads and quickly determine thread size and pitch. 3,Measuring Ruler Scales: This screw thread checker has 6 inch and 15cm measuring ruler scales on both sides, which can help you quickly identify the different lengths of bolts, screws, and nuts to meet more needs. 4,Aluminum Alloy: These bolt nut size gauges are made of thickened aluminum alloy, which has high strength, wear resistance, erosion resistance, no deformation, and is suitable for various working environments. 5,High Accuracy: These thread identifiers are manufactured using high accuracy machinery to ensure that each thread size meets standard specifications, ensuring measurement accuracy and reliability. Specification Item Type: Thread Checker Gauge Material: Aluminum Alloy Package List 1 Set Thread Checker (2PCS) 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.