SPAX Countersunk Torx MDF screws are the ultimate screw for solid MDF, giving a professional invisible finish. Only Spax have patented features including a Spax cut head with ground serrations and countersink ribs for ultimate driving power without splitting the wood. The small milling head gives a clean, flush sinking of the screw head for the best possible visual and practical results. Wirox surface with high protection against corrosion, it is free from chromium-vi and therefore is more environmentally friendly that other surfaces. Features & Benefits • Cutting ribs help the head countersink into wood easily • No pre-drilling required even in hard woods • Ultimate holding power • Hard synthetic coating for easy driving • Deeper recess in screw-head for a stronger bit hold Specifications • Diameter: 3.5mm • Length: 40mm • Quantity: 200 Use: for screwing MDF materials and other thin-walled panels made of wood materials indoors. Spax exclusive Wirox surface Countersunk head with milling ribs pulls particularly easily into the material and can be recessed flush. Optimum power transmission and clean fit with SPAX bit T-Star plus T20 with guide pins Effortless work and longer battery life: no pre-drilling (depending on the wood). Precise attachment and reduction of the splicing effect thanks to the drilling function of the CUT tip. Easier cutting of the wood fibre thanks to Spax-typical wave profile Made in Germany: TÜV certified. Approved by building authorities: European technical approval for screws as wood fasteners in load-bearing wooden constructions (ETA-12/0114) Box contents: 1 Spax-M box, 200 pieces MDF screw, T-Star plus countersunk head, 75° milling head, partial thread, cut tip, WIROX surface, thread diameter (Ød1) = 3.5 mm x total length (Ls) = 40 mm, partial thread length (LgT) = 28 mm, head diameter (Ødk): 6 mm, bit not included, Weight: 0.70327461578 pounds, Manufacturer: SPAX International GmbH & Co. KG