HECO-Schrauben has further expanded its range of wood screws with the introduction of the HECO-TOPIX® screw with a combined hexagon head. The screw head combines the T-Drive with a classic external hexagon, enabling users to work with the new wood screws with open-ended and ring spanners, as well as with bits.(…)
via Combined hexagon head for steel sheet-wood connections | Fastener + Fixing Magazine.