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 optimally in the screw head. The best possible power transfer from the screwdriver to the screw through T-STAR plus enables fast work, and it is significantly more efficient than all other drives. The countersunk head (also known as flat countersunk head) mills 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 floorboards to thicker components like beams or timbers. The short thread screws into the thick component, while the unthreaded shank remains in the attachment part. This creates maximum clamping pressure between the two. The unthreaded part should be at least the thickness of the attachment part. 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 screw's core diameter. The spreading pressure that the core exerts in the wood is thus reduced, preventing the wood from splitting near the edge. The necessary torque of the cordless screwdriver is also reduced, as the screw's core 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 and environmentally friendly even after years in non-directly weathered outdoor areas.