Two impact tools in one: use as a wobble extension bar when an offset clearance is needed or use as a regular rigid extension bar Wobble feature lets you reach and turn fasteners that can only be reached at an angle up to 15 degrees; spring-loaded ball detent holds sockets securely in place Premium Chrome Molybdenum steel tempered with our proprietary heat treatment process to withstand more torque from power tools Expertly coated with manganese phosphate, the preferred coating in military and aerospace, which offers superior protection and corrosion resistance compared to black oxide coating on other impact tools Three 3/8 in. drive wobble impact extension bars: 3, 6 and 12 in. long