You can use this to seal your bottles of beer once you have filled them.
This can be used with most commercially available beer bottles. Simply drink the beer that came in the bottle, clean and sanitise the bottle, fill it with your home brew and crimp a crown cap to the top of it. A few weeks later... start the whole process again!
Easy to use with a magnetic crimping cup to hold caps in place whilst you are crimping.
Far preferable to the hammer bottle crimpers which can be quite dangerous to use.