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You put 1/2 of snap on bottom, then fabric, then second 1/2 of snap on fabric, then close the hinged tool and hit with hammer. But there is no device to align the second 1/2 of the snap, and because the bottom half is under the fabric, and snaps are tiny, it's easy to mis-align. Now you have a snap attached to your fabric, but the halves don't line up. I threw this tool out. Useless. Terrible.
The purple SnapSetters work much better.