✦ Heavy-duty zinc alloy steel construction. ✦ Contoured rubber grip for comfort and control. ✦ Pressure action switch located at the bottom of the 　 knife extends and locks blade in open position when 　 pushed or slammed against any hard surface. ✦ Features safety lock on switch to prevent inadvertent 　 exposure of cutting edge. ✦ Push button for quick blade release - no tools 　 required. ✦ Auto-loading mechanism for instant blade change. ✦ Supplied with 6 blades.