made from chrome vanadium.Reached the DIN standard CONTENTS:18PCS--1/2'DR. SOCKETS:10,11,12,1314,15,16,17,19,21,22,23,24,27,30,32MM2PC-1/2'DR. SPARK PLUGS:16MM&21MM3PC-1/2'DR.EXTENSION BARS:2'&5'&10'1PC-1/2'DR. QUICK REVERSIBLE RATCHET HANDLE1PC-1/2'DR. SLIDING T BAR1PC-1/2'DR.UNIBERSIAL JIONT1PC-ALUMINUM CASE 27PCS SOCKET SET (1/2')