The SPAX typical drive T-STAR plus is a so-called internal hexagon. This shape increases the contact surface of our T-STAR plus, allowing the T-STAR plus bits to fit optimally in the screw head. The best possible power transfer from the driver 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 like engineered wood 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 component. This creates maximum clamping pressure between the two. The unthreaded part should be at least as thick as the attachment component. The term 4CUT refers to the square shape of the screw tip. These edges displace the wood fibers during insertion and create space for the core diameter of the screw. The spreading pressure that the core exerts in the wood is thus reduced, preventing the wood from splitting near the edges. The required torque of the cordless screwdriver is also reduced, as the core of the screw does not have to "squeeze" into the wood. With WIROX, SPAX has developed a coating that far surpasses galvanization in terms of corrosion protection. WIROX does not use chromium (VI), and the screws remain just as durable after years in non-directly weathered outdoor areas, while also being environmentally friendly.