Set of extension bars for use with impact tools Features: Manufactured from Chromium Molybdenum Steel for strength Black Phosphate finish Supplied in a plastic tray Specification: 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: 75mm (3"), 150mm (6"), 250mm (10")