ALL PARTS MADE OF CRV STEEL,ACCORDING TO DIN STANDARD CONTENTS:16 PCS METRIC SOCKETS 8,9,10,11,112,13,14,15,16,17,18,19,20,21,22,24MM 2PCS SPARK PLUG SOCKETS 16,21MM 5PCS ACCESSORY, QUICK RELEASE RATCHET HANDLE, 165MM SLDING T-BAR,UNIVERSAL JOINT,75MM&150MM EXTENSION BAR 23PCS 3/8" DR SOCKETS SET