Abstract: A tool holder for pneumatic and electric power tools to be used when working on step ladders, extension ladders, scaffolding and other precarious elevated working environments where space for maneuvering and storing tools and materials is diminished. The tool receptacle (2) of the tool holder being especially designed to allow the storage of a wide variety of nail guns in a posture with the safety tip extended and the handle conveniently facing up towards the user facilitating the insertion, removal and operation of the tool being stored. The pivoting mounting assembly enables the holder to mount to support members that are at any angle in a vertical plane. The fastening straps with adjustable, quick release buckles enable the tool holder to be quickly and securely fastened to support members that are a wide variety of shapes and sizes. The storage pockets (24) on the front wall (8) of the holder are large enough to carry full size nail clips or a pair of safety glasses.