Chenchuan Tools-gaugestools is a leading supplier and manufacturer of thread gauges. we can supply thread ring gages for external thread and thread plug gages for internal thread. The ring gages are solid, clients can use them directly, no need setting plug gages. The thread plug gages are taperlock, double ends with one handle. All these thread gages include GO NOGO. If clients need left hand thread (LH), please specify specially, we also can supply them. gaugestools is Paypal golden key supplier, we accept Credit card payment (Visa, Mastercard, American express, Discover) through Paypal, Paypal can provide purchase protection for clients.