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FEATURES " Impact duty (Chrome-Molybdenum) steel is high quality alloy steel which provides ultimate strength and durability. " 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 and won't wear off. Contents: 8 / 10 / 11 / 12 / 13 / 14 / 16 / 17 / 19 / 21 mm.