Tap Adapter, Tap Size 7/8 In., Tap Square Size 0.523 in, Compatible with Product Type ANSI Taps, Coolant Fed Non-Coolant Through, Features Automatically Stops Spinning when Bottom is Reached, Prevents Broken Taps, Quick-Change Style, For Shank Type ANSI Tap Shank, For Use With ANSI and Metric/ANSI Shank Taps: 7/8 in, M22