3.5 x 20 Timberfix 360 - High Performance Screw The combination of a cutpoint, performance countersunk head and the ground serrations gives you a fantastically priced performance screw. APPLICATIONS For universal use in wood, chipboard, MDF & plastic. FEATURES Performance countersunk head: Cutting ribs help the head countersink into wood easily. Crew head ribs help reduce the thread being stripped when fixing hinges etc. Deeper recess in screw-head for a stronger bit hold. Cutting Point: No splitting even when working close to the edge. No pre-drilling required even in hard woods. Screw point takes immediate hold. Ground Serrations: Reduces driving in torque. Hard synthetic coating for easy driving. Ultimate holding power.