Abstract: A method and apparatus for forming a circular offset head nail including first and second die-rings having a plurality of grooves for holding nail blanks. A pre-bender adjacent the head forming roller bends an end of the nail blanks so that a head forming roller adjacent the pre-bender rolls the circular offset heads in a free-flow form. The pre-bender and the head forming roller include an angled surface for forming the circular offset head.

Abstract: A percussion tool, disclosed as a nail driver, having a plunger-like hammer or driver which is driven through working and return strokes by a power piston movable in a cylinder which is pressurized with a working fluid and vented by selective actuation of a unique and simplified valving arrangement to effect the working and return strokes. The disclosed nail driver has a nail magazine which is attached to the tool in a novel and rugged manner which resists bending and other damage of the magazine by the periodic impact forces generated in the course of nail driving operation of the tool.