Milwaukee 48-22-9342 - 4pc 1/2” Drive Extension SetThe extensions in this 4 piece set feature the largest knurling surface, offering the most control. Each extension has knurling on the female drive end to help when hand tightening fasteners or working with oily materials. Additionally, select extensions in the set have knurling on the shaft for more control. The set includes a durable compact storage rack designed to optimize drawer space for long term use. Chrome plating offers corrosion and rust