Heck, I couldn't even get all the rounds into my KelTec mags without severely screwing up my fingers. Work great on CZ82 mags as well.
They make a great speed loader for Glocks too. No way I could get the 10th round in my 10 round mags without it.
http://www.youtube.com/watch?v=7HOV5nDo3SE&feature=related