This is the best $2.99 you'll ever spend!  Don't wear out your thumbs trying to load Ruger MKII and similar style magazines.  The strong plastic magazine loader easily slips over the mag and pulls the loading button down as you insert the ammo.  Once you try one, you'll never load mags again without it... unless you loose it or your buddy winds up with it!  At this low price, you better order a couple!