The Capri Tools 3/4 in. Drive Impact Extension Bar extends the reach of your power tools to reach hard-to-reach fasteners. Spring-loaded ball detent holds sockets securely in place. These extension bars are constructed of 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 3/4 in. drive impact extension bars are included in the set: 4, 6 and 10 in. long.