Craftsman 21 Pc. Socket Drive Tool Accessory Set, Extension Bars, U-joints and Adapters - Ideal for All 1/4, 3/8 and 1/2 Inch Socket Sets - Backed By Our Lifetime Replacement Guarantee!!! Ideal for all our 1/4, 3/8 and 1/2 in. sockets, this set of drive tools give you the flexibility to tackle any project Extension bars provide extra reach for tight spaces, adapters allow you to use different drive size sockets with ratchets and U-joints are perfect for fasteners in a tight space or at an angle Set includes 13 extension bars in three drive sizes, 1/4-inch (1-1/2, 3, 6 and 14 in.), 3/8-inch (1/2, 3, 6, 10 and 20 in.), 1/2-inch (2, 3, 6 and 10 in.), 5 adapters, 1/4-inch (3/8 in.), 3/8-inch (1/4 and 1/2 in.), 1/2-inch (3/8 and 3/4 in.). 3 universal joints (1/4, 3/8 & 1/2 in.) Backed by Craftsman's Lifetime Guarantee