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 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 floorboards to thicker components like beams or posts. The short thread screws into the thick component, while the unthreaded shaft remains in the attachment component. This creates maximum clamping pressure between the two. The unthreaded part should be at least equal to 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 edges. The necessary torque of the cordless screwdriver is also reduced, as the screw's core does not have to "squeeze" into the wood. The abbreviation A2 in our stainless steel screws comes from the steel alloy. Screws made of stainless steel A2 provide high protection against corrosion and medium strength. Their resistance to seawater and acids is low. Therefore, they are used in outdoor applications in coastal areas.