The SPAX typical drive T-STAR plus is a so-called internal hexagon. This shape increases the contact area of our T-STAR plus, allowing the T-STAR plus bits to fit perfectly into the screw head. The optimal power transmission from the screwdriver to the screw through T-STAR plus enables quick work, significantly more efficiently than with any other drives. The countersunk head (or flat countersunk head) carves a recess into the wood with its polygonal underside ("pockets") and can therefore be sunk without additional countersinking of the screw hole. The countersunk head sits flush with the surface. The screws with partial thread are excellent for fastening thin components such as wood-based panels, boards, or planks to thicker components like beams or posts. The short thread screws into the thick component, while the unthreaded shank remains in the attachment. This creates maximum clamping pressure between the two. The unthreaded part should be at least as thick as the attachment. The S-tip is characterized by the fact that the thread extends into the front flanks. When you position the screw and start the cordless screwdriver, this thread immediately grips the wood and pulls the screw in effortlessly. This allows for quick work without scratching the workpiece due to the screw tips slipping. With WIROX, SPAX has developed a coating that is far superior to galvanization in terms of corrosion protection. WIROX does not use chromium (VI), and the screws remain just as durable even after years in outdoor areas not directly exposed to the weather, and they are also environmentally friendly. WIROX screws are the first choice for all open structures without direct weather exposure, such as carports or pergolas; for direct weather exposure, such as on terraces, we recommend our screws in stainless steel.