Shockwave magnetic nut driver set is constructed with proprietary steel and a heat treated process for maximum strength and optimal durability. Features a strong magnetic tip providing a secure grip, chamfered edge for hassle-free fastening in tight spaces and color coded band Offering easy size identification. The 4 piece kit includes Shockwave 1-7/8" magnetic nut driver 1/4", Shockwave 1-7/8" magnetic nut driver 5/16", Shockwave 1-7/8" magnetic nut driver 3/8", Shockwave 1-7/8" magnetic nut driver 7/16".