Set includes 3 different extension bars. All of the pieces are drop forged, heat treated and fully polished. Ideal for easy access in confined spaces. The bars are a 1/4inch drive. Sizes in this set 3inch (75mm), 6inch (150mm) and 9inch (225mm). Features: Extension bars Chrome Plated With Sprung Ball Retainer All are drop forged, heat treated and fully polished Ideal for easy access in confined spaces 1/4inch drive Sizes: 3inch (75mm) 6inch (150mm) 9inch (225mm)