GEARWRENCH offers a wide range of impact products in open stock & sets that are designed to deliver the performance and strength that the professional users require. They are made from chrome molybdenum alloy steel for exceptional strength and durability. Our sockets have a manganese phosphate coating to resist corrosion. The sockets also feature highly visible laser etched markings and a secondary size hard stamping. The sockets feature off-corner loading to reduce fastener rounding. The GEARWRENCH impact product family will allow the professional user to FORGE AHEAD. Chrome molybdenum alloy steel (Cr-Mo) for exceptional strength and durability Off-corner loading design for reduced fastener rounding UPC 099575895067 ASIN B00UM690TY Set Name 4 Pc. 1/2 Drive Impact Extension Set 3 , 5 , 10 & 15 Brand Name GEARWRENCH Unit Count 1.0 Count Item Length 15 Inches Item Weight 3.11 Pounds Drive System Nutsetter Finish Types Manganese Phosphate Manufacturer Apex Tool Group Model Number 84950N Material Type Chrome Molybdenum Steel Item Type Name 4 Pc. 1/2 Drive Impact Extension Set 3 , 5 , 10 & 15 Number of Pieces 4 Bit Compatibilities 1/2 drive bits Bit Set Composition Bit Set Included Components Socket Wrench Drive Bit Shank Style Square Manufacturer Part Number 84950N Manufacturer Warranty Description Standard Limited Lifetime Global Trade Identification Number 00099575895067