Slides are strap adjusters. Used in conjunction with side release buckles, they allow for a fairly large range of sizes in collars, fanny pack belts, etc. You would use these if you are working with a thicker material, or if you are running your material through the slide more than once.
Available Sizes: 3/4", 1", and 1 1/2"
Sold in packs of 10 or 100.