PRC DOUBLE RING SPANNER WRENCH SOCKET NUT FEATURESProfessional plating prevents wrenches from corrosion.Superior life-time test.Matte or mirror finish. FUNCTION:- a spanner with a ring-shaped jaw with internal serrations.- Apply force to all six sides of the fastener.- Offer additional grip meaning they won't slip off nut or bolts when loosening. SIZE (mm):6X7mm8X10mm10X11mm10X12mm12X14mm14X17mm18X19mm20X22mm25X28mm27X30mm30X32mm GOOD QUALITY OF PRODUCT