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The system consists of a gear plate that attaches to the polisher in place of its factory backing plate. Onto this gear plate, you can mount a 4 inch backing plate. This backing plate is designed specifically for this gear plate. They each attach securely to the polisher with the wrench included with your FLEX. Once in place, the backing plate perform like part of the machine. Hook and loop fasteners allow you to change pads quickly.The FLEX XC3401 4 Inch Changeable Backing Plate System will allow you to use 4 and 5 inch pads with just the two pieces included here. Perform spot detailing with your 4 inch pads. Then easily switch to 5 inch Hybrid pads for all-over buffing.