- The 4pc. 1/2" Drive Wobble Impact Socket Extension Set is made of Chrome Molybdenum alloy steel for long life. The radius corner design extends the life of fasteners. This set comes with a heavy duty blow molder storage case. The wobble drive provides 15" offset in all directions. The set consists of 3"-(2503W), 5"-(2505W), 10"-(2510W), 15"-(2515W).