20 Drive rods, shears, corner drives, connecting rods, closure pieces, security closure pieces, closure rails, mushroom headed bolts, spacers, closure tongues, center locks, snips, ramps, carriages, guide pieces, guide rail tracks, ground rail tracks, gliders, caps, ventilation catches, couplings, locking plates, and hinges made of plastic for windows, doors, fanlight windows, and skylights, sold as a unit; mechanical gears and rods made of plastic for windows, doors, fanlight windows, and skylights, sold as a unit; mechanical locks and keys made of plastic for windows, doors, fanlight windows, and skylights; padlocks made of plastic; hand operated locks made of plastic for emergency exits; plastic locks against burglary and anti-burglary chains made of plastic for windows, doors, fanlight windows, and skylights