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 transmission from the screwdriver to the screw through T-STAR plus enables quick work, significantly more efficiently than with any other drives. While the countersunk screw is designed flat for flush sinking of the screws, the lens-shaped countersunk head has a convex curvature. Depending on the type of screw and surface finish (stainless steel, nickel-plated, antique), these screws become a decorative element, for example, in furniture construction or when attaching baseboards. The screws with partial thread are excellent for fastening thin components like particle boards, planks, or floorboards to thicker components like beams or timbers. The short thread screws into the thick component, while the unthreaded shank remains in the mounting part. This creates maximum clamping pressure between the two. The unthreaded part should be at least the thickness of the mounting part. The CUT tip of our SPAX screws allows for extremely fast and effective driving of our wood screws without pre-drilling. The arrow-shaped CUT tip reduces splitting and tearing of the wood in combination with the shaft profile. Additionally, the CUT tip enables very precise and slip-resistant positioning of the screw tip even on smooth surfaces. The abbreviation A2 for our stainless steel screws comes from the alloy of the steel. Screws made of stainless steel A2 provide high protection against corrosion and medium strengths. Their resistance to seawater and acids is low. Therefore, they are used for fastening in outdoor areas far from the coast.