·Made of high hardness chrome molybdenum steel for durability

 ·Includes:10Pcs 3/8" Dr. sockets 9mm 10mm 11mm 12mm 13mm 14mm 15mm 16mm 17mm 19mm； 

 3/8" drive for use with socket wrench or impact wrench; 

·Reverse spiral flutes are designed to bite down to provide maximum gripping power.