UNE 16515:1991 ASSEMBLY TOOLS FOR SCREWS AND NUTS. DOUBLE-HEADED OPEN-ENDED WRENCHES,DOUBLE-HEADED RING WRENCHES AND COMBINATION WRENCHES. MAXIMUM WIDTHS OF HEADS.
1991UNE 16515:1991 ASSEMBLY TOOLS FOR SCREWS AND NUTS. DOUBLE-HEADED OPEN-ENDED WRENCHES,DOUBLE-HEADED RING WRENCHES AND COMBINATION WRENCHES. MAXIMUM WIDTHS OF HEADS.