Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - UNC - 1.3/8 x 6Meet the Baer Heli Coil Tap a precision tool designed for impeccable thread repairs and reinforcements with Heli Coil wire thread inserts. Engineered for durability and consistent performance, this Bottoming Tap (STI) delivers clean, full depth UNC threads every time, specifically sized for 1 3 8 x 6 applications. Why this Heli Coil Tap stands out Bottoming tap design ensures complete thread engagement to the full depth of the hole, which is essential