The pin is attached to the back of the CT grip to basically hold the grip onto the frame. There's a small section that rides on top of the XD frame, and the pin connects this small piece to the rest of the CT grip. The punch is included to push the pin out to slide the CT grip off.
Hope that helps.
Oh and CT grips are outstanding, especially when my wife (who has never shot before) can out-shoot the off duty cops a few lanes down.
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