CHROME SOCKET 3/8"" DRIVE 12 POINT 21MM DEEP MADE OF HEAT-TREATED CHROME VANADIUM STEEL FOR DURABILITY. OUR SOCKETS FEATURE HIGH-POLISH CHROME FINISH WHICH PROTECTS THE TOOLS FROM THE HARSH WORKING ENVIRONMENTS FOUND IN TODAY'S WORKPLACE. LIFETIME WARRANTY. ALL SOCKETS ARE MARKED WITH PART NUMBER FOR EASY IDENTIFICATION.