At first glance, the Trim Tool from Black Diamond might look like a letter opener, but a letter opener won't cut through thick nylon and tacky glue in order to trim your climbing skins to the perfect size. Simply attach your too-wide stock climbing skins to your skis and run this tool down the edge of your skin. As you do so, skin material will fall away and you'll be left with a skin perfectly contoured to the shape of your powder boards. Step away from the razor blades and scissorsthis tool replaces both.
It definitely does the trick on cutting your skins- it also comes with the BD models, so no need to purchase it separately. Helps trim down the tiny bit from the edges for a more accurate- I just use scissors for the big hunks. But it does do the trick for the more pristine cut!
This trim tool is to trim skins and works well enough for that. But, I did once also use it to open a letter from Publisher's Clearing House, too. Worked quite well in that department, as well. One star off because it didn't fare well when I tried opening a beer bottle with it.
I bought this at the same time as a pair of BD ascension skins. The tool worked great on these, but what I didn't realize at the time was that an identical tool also comes with the skins themselves. At under $3, not a big deal, but save yourself the trouble if you are also buying skins. I also think a box knife would work just as well if you are trimming the skins on the ski (which is the only way you should do it IMO).