A nail holder for feeding nails serially into a setting device from which they are driven by an explosive force into a target material is formed by an elongated belt or strip which has a plurality of longitudinally spaced holes each of which holds the shank of a nail. Between each pair of holes a transversely extending slot is arranged which extends across a major portion of the strip between its longitudinal edges. When a nail is driven from the setting device, its head contacts the strip and the section between the slots separates from the remainder of the strip forming a disc or washer on the shank of the nail. The disc or washer has an area which is a multiple of the area of the nail head and its extended surface is useful in securing low strength materials to the target material.