Tapping Adapter, Tap Size 7/16 in, Tap Square Size 6.15mm, Compatible with Product Type TG Collet Chucks, Coolant Fed Non-Coolant Through, Features Industry Standard Erickson Single-Angle Collet System;Provides Tremendous Grip (3:1 Advantage) and Accuracy for Tapping Applications;Slot in Back of Collets Acts as a Drive for the Tap Square