Use 3-in-1 Primer Pocket Correction Tools with an 8-32 drive system (case prep center). Place the adapter over the 1/4″ hex shank of the 3-in-1 Primer Pocket Correction Tool. Align the set screw with a flat surface of the 1/4″ hex shank and tighten set screw with a 3/32″ hex key.