Abstract: A quick release and attachment coupling for operating tools for earthmoving or excavating machines having an attachment head pivotally mounted on the boom of the machine. A locating head is fixed to, or formed integrally with, an operating tool and has a pair of spaced side plates, and stop members in the form of a transverse bar or beam and a hook or jaw. The attachment head is tightly positioned between the spaced side plates, with V-shaped slots at one end of the head engaged with the beam. A movable block in the head is moved by a hydraulic ram into engagement with the hook or jaw to lock the attachment head to the operating tool.