Feature:Made of chrome vanadium steel, overall heat treatment, high hardness and good toughness.The surface of the bit socket is sandblasted, which is not easy to rust and is more beautiful.Widely used in construction industry, manufacturing industry, home equipment repair, auto repair industry, etc.Equipped with a storage box for easy storage and carrying, it is not easy to lose the bit.With extension rod design, which can repair the problematic workpiece in a narrow space where the hand is inconvenient to reach.Specification:Material: Chrome vanadium steelProduction process: Overall heat treatmentSurface treatment: Abrasive blastingLength: 110mm / 4.3inSquare bit socket: 3/8Hex bit socket: 1/8, 3/16, 7/32, 1/4, 9/32, 5/16, 3/8Package list:7 * Bit socketNote:The actual product color may deviate from the photo due to light.There may be a slight deviation in the measurement of product..