Hex key L-wrenches for hexagon socket screws (mm) The PB Swiss Tools hex key L-wrenches for hexagon socket screws (mm) are being used all over the world in mechanical, metal and vehicle construction. Professional users choose tools from the wide range of 0.71 to 22 mm. For every L-wrench, tolerances are guaranteed that are smaller than a hair. This perfect dimensional accuracy and the hard and tough special alloying make for precise, durable tools. L-wrenches for hexagon socket screws are available in a chromed version and powder-coated with colorcoding. The variety of long and short hex key L-wrenches with and without ball point leave nothing to be desired.