A steel pin is disclosed of a type to be forcibly driven into a steel substrate by using a powder-actuated tool. The steel pin has a substantially cylindrical shank, and a substantially sharp point which extends from one end of the substantially cylindrical shank, which conforms substantially to a tangent...http://www.google.es/patents/US5860866?utm_source=gb-gplus-sharePatente US5860866 - Steel pin and method for its manufacture
