Ball end on long arm allows up to 25 angle of entry for use in hard to reach areas. Allows faster insertion and removal of screws. Chamfered straight hex tip on short arm for more torque and leverage to remove stubborn screws. Chrome molybdenum steel construction for strength and durability. Mirror polished chrome plated finish resists corrosion This extra long ball end hex key set includes the following sizes: .1.5mm, 2mm, 2.5mm, 3mm, 4mm, 5mm, 6mm, 8mm and 10mm. Other features include: Patent pending textured finish for improved grip, Color coding for easy identification, and Laser etched size markings that are easy to read. Lifetime warranty.