Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - Metric - M30 x 1.5The Baer Heli Coil Tap Wire Thread Insert Bottoming Tap (STI) Metric M30 x 1. 5 is a professional grade tool designed for precise thread repairs and reinforced, long lasting threads. Built to support reliable insert installations, this bottoming tap ensures clean, accurate engagement when working with helicoil METRIC inserts in a variety of metals. Key capabilities that matter in the shop Full depth tapping for blind holes. Bottoming taps cut threads