Baer Heli Coil Tap - Wire Thread Insert - Bottoming Tap (STI) - Metric - M28 x 1.5The Baer Heli Coil Tap is the precision tool you reach for when you need flawless thread repairs and reliable reinforcements. Precisely sized for metric M28 x 1. 5 holes, this bottoming tap (STI) delivers clean, full depth threads that let Heli Coil wire thread inserts seat securely and perform under load. Built for demanding work, it turns worn or damaged threads into durable, repeatable fastener interfaces you can trust. Why this Baer Heli Coil Tap