Gunson 77106 Universal Thread Gauge 4pc

Identifies bolts pipe threads and spark plugs 10-18mm. Identifies bolts | pipe threads and spark plugs 10-18mm Range 5/16" to 3/4 ", 10tpi to 44tpi, metric thread sizes 2.5 to 22mm and pitch of 0.45mm to 2.5mm. Range 5/16" - 3/4", 10tpi - 44tpi, metric thread sizes 2.5 - 22mm and pitch of 0.45 - 2.5mm Fast and accurate