Set of extension bars for use with impact tools. 1/4" Drive bars: 50mm (2"), 100mm (4"), 150mm (6"). 3/8" Drive bars: 45mm (1 3/4"), 75mm (3"), 150mm (6"). 1/2" Drive bars: 50mm (2"), 125mm (5"), 250mm (10"). Made from chromium-vanadium steel for strength and durability and helps resist abrasion, oxidation, and corrosion with black oxide finish. Supplied in moulded tray ideal to keep them organised in a tool chest or drawer.