"ADDITIONAL REACH. Long length hex bit sockets are 6\" in length allowing for access where a standard bit socket length is too short","STRENGTH. Manufactured with S2 steel and sockets with mirror polish finished chrome-vanadium that resists abrasion and corrosion","EASY IDENTIFICATION. Stamped markings for easy size, part number, and ADV identification","LIFETIME WARRANTY. Guaranteed for a lifetime of use 3/8" DRIVE LONG HEX BIT 4 MM BXYL4MVA | Matco Tools