Gunson Universal Thread Gauge – 4 Piece. Four individual gauges measuring pitch and thread in US and metric sizes. Manufactured from aluminium Identifies bolts | pipe threads and spark plugs 10-18mm US and metric sizes Range 5/16″ – 3/4″, 10tpi – 44tpi, metric thread sizes 2.5 – 22mm and pitch of 0.45 – 2.5mm Fast and accurate
