XZN, also known as the triple-square drive system essentially overlays 3 squares over one another to give you driver teeth that have a 90-degree angle. This drive system can also be used with a standard square Robinson driver if no other option is available. XZN fasteners are typically used where high torque is needed - usually specific areas in a car - and are often found in German vehicles like BMW, Volkswagen, Porsche and Mercedes to name a few. Given the specialty use of the triple-square for German automobiles, it makes sense that Hazet and Stahlwille are the primary makers of XZN screwdrivers and bits, but you can also find some made by Wiha too.
At Haus of Tools we offer a FREE GIFT with your order based on your purchase total, choose from a number of offers based on the price point. The best part of this program is it's always running and always being updated with new swag from your favorite brands. Look through our Freebies Page for a full list of ongoing promotions.