The hands-free Accu-Strike Welding Helmet, which doubles as a grinding shield, is made of strong, durable, lightweight polycarbonate. Its filter visor, with 5¼- x 3-inch view area, consists of a clear plastic plate, a polycarbonate resin plate, and behind those a clear plastic, impact-resistant plate. The visor is opened and closed by the wearer simply lowering and relaxing his jaw in the helmet's chin strap. It can also be locked open for grinding or extended viewing then closed by nodding the head. (Optional hard-hat and cooling-fan helmet available.)