Side Release Buckles Clips for 20 mm Webbing, Luggage, Back Pack / Rucksack, Straps (Black, 2 Pieces). Our quality buckles come in various sizes that will allow you to use these buckles with various strap sizes. The size refers to the size of the strap rather than the buckle itself. Made from strong and good quality plastic they have high tensile strength. Side release action is easy to use, yet strong to ensure maximum hold. Press inwards to simply unclip the buckle, and clip back together for the buckle to be together. Once together the buckle will hold firmly together. These clips can be used for multiple uses such as belts, backpacks, luggage straps, webbing straps, lanyard clips and much more.