The D.A. Adaptor 5/8" to 5/16" allows your dual action polisher to accept a rotary backing plate. The adapter works with any of our rotary backing plates. Use this adapter with the Meguiars Dual Action Polisher G110, Porter Cable 7424XP, the Griot's Garage Random Orbital Polisher, and any dual action polisher accepting a 5/8" thread. For maximum safety and performance, tighten the adapter onto your polisher with a wrench.