You can load the Smith Wesson Model 41 mag and save your fingers at the same time. This is a proven thumb saver. No moving parts make it easy to use and reliable. Slides over the magazine body and engages the follower button. Provides a hand hold to compress and hold the follower and spring as you drop in ammunition. One of the simplest little devices you may ever stick in your range bag try one out today and save that aching thumb! Plus a carabiner style clip so you can find it in your range bag! Quick and Easy Loads of Fun!