The 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 protection. All Milwaukee® Mechanics Hand Tools are backed by a lifetime guarantee. • Largest Knurling Surface - Precision Control • Compact Storage Rack - Optimize Drawer Space • Easy to Read Size Identification • Knurling on Female End Helps When Hand Tightening • Corrosion Resistant • Chrome Plated • Rust Protection • Lifetime Guarantee • (1) 1/2" Drive 3" Extension; (1) 1/2" Drive 5" Extension; (1) 1/2" Drive 10" Extension; (1) 1/2" Drive 15" Extension; (1) Storage Rack • INCLUDES: (1) 1/2" Drive 3" Extension; (1) 1/2" Drive 5" Extension; (1) 1/2" Drive 10" Extension; (1) 1/2" Drive 15" Extension; (1) Storage Rack