Metric and Imperial 2-in-1 Thread Gauge: Contains two types of thread gauges for measuring thread dimensions to quickly and accurately find the size of replacement screws
Thread gauges include 52 ranges (24-piece 60-degree metric and 28-piece 55-degree inch thread gauges)
Chrome-plated surface, not easy to rust. Clear scale, easy to read data. The rotary switch is freely adjustable to lock in the correct dimensional results of the measurement