Universal Thread Gauges Identifies bolts, fittings, pipe threads and spark plugs with US or metric threads. Aluminum gauges identify: 1) US threads from #5 to 3/4 inch and pitch of 10TPI to 44TPI; 2) Metric threads from 2.5 to 22 mm and pitch of .45 to 2.5 mm; 3) Pipe threads 1/16 inch to 1/2 inch with 14TPI to 27TPI; and 4) Spark plug threads 10 to 18 mm. Shipping Weight .10 pounds
