MILWAUKEE 4932352856 SHOCKWAVE HEXAGON SOCKET 12 INCH 21MM Best fitting thanks to 6 gripping points Recessed corners allow torque to be transferred across the flats of the socket rather than producing stress on the points or corners Thin wall construction provides access to tight spaces Deep wall construction provides clearance for protruding bolts Laser etched size markings for easy identification & won&39t wear off Up to 4500 Nm torque