The M-BDK-1 Balldriver® Allen Wrench Set includes six metric wrenches. Sizes include: 1.5, 2, 2.5, 3, 4, 5 mm. Balldriver® Allen Wrenches are made from high torque steel with a hardened ball tip for angled entry up to 25°. They are much faster to use than standard Allen wrenches and make tightening hard to reach screws simple. Balldrivers have a screwdriver handle for comfort and speed.