VCOIL Plug Gauge (NoGo) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M39 x 3 Tiny Tool Inserts this intermediate-precision reamer is designed

this intermediate-precision reamer is designed to finish holes with consistent diameter and a smooth finish

this collet keeps the tool centered for consistent cuts and tight tolerances

helping you protect production timelines and maintain consistent results

simplifying setup and repeatability

VCOIL Plug Gauge (NoGo) - Metric (STI) - Heli Coil Gauge - Right Hand - 4H - M39 x 3 Tiny Tool Inserts this intermediate-precision reamer is designedVCOIL Plug Gauge (NoGo) is a precision metric thread gauge designed for helicoil inserts, combining Go and No Go checks into a single, reliable tool. Its ideal for machinists and quality labs working with STI metric threads to verify correct engagement. Thread system: Metric (STI) with M39 x 3 right hand threads and 4H tolerance. Go No Go gauge: Integrated go end that threads in by hand and a no go end that must not thread in more than two turns.