Wera Bits are designed for the most demanding applications in trade and industry. They are designed to have the ability to transfer high torque loads, safe to use and extremely durable. Bits used for industrial applications are subject to permanent stresses. The Wera tough viscous bits for industrial applications are coated with and extremely hard and abrasion-resistant titanium nitride. The elasticity of the tough viscous bit combined with the TiN coating makes them ideal for use on mass production lines. Wera ? The Best Tools For The Job!