A-A-53421, COMMERCIAL ITEM DESCRIPTION: SCREW, INSTRUMENT, SPECTACLE FRAME 7 OR 5 BARREL HINGE (21 MAR 1988

A-A-53421, COMMERCIAL ITEM DESCRIPTION: SCREW, INSTRUMENT, SPECTACLE FRAME 7 OR 5 BARREL HINGE (21 MAR 1988)., This commercial item description covers two types of instrument screw suitable for attaching temples onto the spectacle frame. It is intended to be used on the 7 or 5-barrel hinge, as specified in the procurement documents.