Socket 1/2 inch Drive Metric 17mmOverviewChrome vanadium steel hex metric socket. Chrome-plated satin steel finish. Chamfered end for positive nut location. Radius design for added torque and long life. Knurled band, ball retention hole. To DIN3124/ISO2725 and DIN3120/ISO1174. Loops 17mm Steel Hex Socket ½" Inch Drive Allan Nut Chrome Bit Bolt Tightening in Metallics