These simple push action loaders help you load up a lot of magazines quickly, without pinched fingers. Simple to use. Slide over the magazine, push down on the follower with your finger to get it started, and begin inserting rounds pressing down on the loader to take up spring pressure as you go. Rugged one piece design. Molded from lightweight 50% glass-filled polymer. Heat, impact and solvent resistant. For use with Black Dog magazines. Made in the USA.