This hand tool socket set is chrome vanadium,and have reached "DIN"standard,please purchase it without any worried. 37PCS HAND TOOL SOCKET SET(1/4")CONTENTS:10PCS-1/4'DR. SOCKETS:4,5,6,7,8,9,10,11,12,13MM6PCS-1/4'DR. DEEP SOCKETS:5,6,7,8,9,10MM2PCS-1/4'DR. EXTENSION BARS:2' & 4'1PC-1/4'(M)*3/8'(F) ADAPTOR1PC-BIT COUPLER1PC-1/4'DR.UNIVERSIAL JOINT3PCS-HEX KEYWRENCH :1.5.2,2.51PC-1/4'DR. RATCHET ...