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 transfer from the screwdriver to the screw through T-STAR plus enables fast 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"), allowing it to 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 engineered wood panels, boards, or floorboards 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 the thickness of 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 screw's core diameter. The spreading pressure exerted by the core in the wood is thus reduced, preventing the wood from splitting near the edge. 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 and environmentally friendly even after years in non-directly weather-exposed outdoor areas.