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The Blue Spot 3 Piece Flexible Extension Bar Set is manufactured from flexible spring steel with Chrome Vanadium sockets for increased durability the unique flexible design makes it easy to tighten and loosen nuts that are off centre and in hard to access areas where a regular extension bar will not fit. The set comprises 1/4"-3/8"-1/2" bars on a handy plastic storage hanging rack. Sizes 1/4" 150mm(6"),3/8" 200mm(8"),1/2" 250mm(10").