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Clarke's quality socket set is manufactured from durable & corrosion resistant high chrome vanadium steel, and includes a range of the most popular metric & imperial sized 3/8" drive sockets. The lifetime guarantee will further inspire confidence in this already excellent set. The PRO127 offers excellent value and is a real pleasure to use. The lifetime guarantee covers defects in manufacture or materials during the lifetime of the tool, however this guarantee does not apply to the ratchet mechanism.