Stahlwille Ratchet Ring Spanner 1/4 x 5/16 AF STW25A14X516 Series 25A double ended imperial ratchet ring spanners have bi hexagon jaws with a flat profile. Made of solid steel, chrome plated.They are equipped with AS drive, this permits high transmission of forces to the lands of the nuts and bolts without damaging them.Size 1/4 x 5/16 AFLength 109mm STW25A14X516