The Vario 2000 uses Helko Werk's patented axe design - a German engineered fastening system that introduces incredible versatility and efficiency across the Vario product line. All Vario heads, handles, and fastening components are fully interchangeable and inter-compatible. The heads are assembled with bolts which are driven through the handle and secured by a butt-plate retainer cap. A steel overstrike protector covers the front of the assembly and offers protection to the handle. The bolts are keyed to a simple Allen wrench, which is supplied with every axe. Ensure your bolts are tight to prevent parts from coming loose over time. The entire product line is comprised of 5 different blades and 3 handle lengths, covering all applications and giving the user the unparalleled ability to mix and match components to create the right tool for the task at hand.