High quality gola key set, 10 year warranty. All parts are made of high-quality chrome-vanadium steel. All heads and parts made by forging. Nickel finish. Bit tips are S2 alloy steel. Ratchets have a fine division of 72 teeth, ratchet body made of CrV steel, tooth mechanism made of S2 steel, ergonomically shaped handle. Use in industry, professional services, car workshops. Durable plastic case.