The ERGO Tactical Deluxe Zero Grip Plug is designed to plug the cavity on the bottom of the Tactical Deluxe Zero Grips. Securely press fits into the bottom of the Tactical Deluxe Grip and helps prevent debris from lodging in the cavity of the grip. It also functions as a shock-absorbing pad to protect the grip when setting the rifle down on hard surfaces.This Plug Fits the Following Grips:TDX-0 Tactical Deluxe GripTDX-0 Tactical Deluxe Grip Flat Top