Inserts-spacer accommodate .380 to .45 ACP in 4 different size. No fumbling around with magazine aligning. These magazine loaders work just great for those zig-zag double stacker magazines but for shooters needing to load single stackers this is the solution to faster, easier loading. Slip the IMFISHING insert into your loader and load your single stack .380, 9mm, .40 and .45 caliber thin magazines, slip out the insert to load fat double wide mags, it couldn't be easier or faster. The width dimension of your magazine should be slightly smaller than the insert slot width. Accessories can be easy to lose at the range or hard to find in your range bag. Our inserts are easy to find because they are a different color than the bottom of your range bag. The inserts are available in 4 different sizes. Please see sizing information below in the Related Video Shorts section. For example: INSERT- #17 -Magazines width up to 0.67"(17MM) 1911 .45'S -- SPRINGFIELD XDS, INSERT- Designed for the universal type speed loader Magazine loader The spacer outside dimension is 37.12 mm ( 1.46”) , by 27.2mm (1.07 “)./ MADE IN USA ......FOR SIZING HELP REFER TO Related Video Shorts found elsewhere on this page,