A quality FIVE piece, highly polished extension bar set. Manufactured from Chrome Vanadium Steel (CR-V) for longevity and durability and helps resist abrasion, oxidation and corrosion. Great for easy access to hard to reach nuts and bolts. They have a 1/2" drive and come in lengths 100mm, 150mm, 350mm, 450mm and 600mm. Each extension bat has a knurled section for additional grip. Supplied in a handy EVA foam tray for neat storage and easy transportation.