Welcome to Oso Grande's Multi-Tool Shop... Your Quality Connection for the Best Multi-Tools on the Planet! The first Multi-Tool was invented and designed by Tim Leatherman of Leatherman Tools. The multitool has become extremely popular worldwide as an easy-to-carry toolbox. Multi-tools are made of stainless steel and most are based on a pliers with a variety of pull out tools including screw drivers, knife blades, files, saws, nut drivers and more. Oso Grande has a large selection of multi-purpose tools from the top manufacturers at unbeatable low prices, guaranteed!