Abstract: Broad head arrowheads of the type that comprise expanding blades. Such broad heads comprise two blades a tip and a ferrule, each blade having a wing and an aperture, the ferrule comprising a passageway into one end of the ferrule along the longitudinal axis of the ferrule dimensioned to accept a pin having a longitudinal axis transverse to the longitudinal axis of the ferrule so that when the pin is passed through the apertures of the blades and inserted into the passageway into the ferrule, the tip can be fastened to the one end of the ferrule with the blades folded back on the ferrule with the wings of the blades extending from the ferrule so that when the mechanical broad head penetrates a target, the wings of the blades engage with the target causing the blades to swing out from the ferrule on the pin as the pin slides further along the passageway into the ferrule.