This is a little cap looking thing that you can put on the top of coin rolls, twist it and it will crimp the end like a factory roll. They work quite well and I sell them on my eBay store. 

Instructions:

1) Fill coin wrapper with the proper number of coins, being sure they are pushed down to the bottom of wrapper.

2) Firmly hold the crimper in your hand, take filled coin wrapper and insert open end into the proper crimper position 

3) Twisting the crimper, rotate 5-10 times while pushing inward with some pressure and coin wrapper will crimp over. Do Not Force the roll too hard!

4) Crimper needs to touch coins to be finished. If not, place wrapper back into twist-n-crimp coin wrap sealer and push deeper - while you rotate 5 times. This can vary based on how old the crimper is and how worn it is.

Note: The crimper works best with NF String preformed rolls you can usually find at a dollar store (The brown ones) Other preformed rolls work but aren’t fully tested by me for quality and functionality.

A great gift idea for any coin collector or anyone who frequently rolls coins!