Nickel chrome plated for corrosion protection. Maxi Drive ring ends for increased grip & reduced fastener damage. Forged from chrome vanadium steel to ISO 3318 & DIN 3113 for proven performance. Re-usable plastic rack for easy storage. 6 piece set comprising. 10 mm., 11 mm., 12 mm., 13 mm., 14 mm. & 15 mm.