Professional Elite Performance Multi-Purpose Woodscrews. Ideal For Fixing Into Most Wood Applications. Elementech 400 Surface Coating Provides Corrosion Resistance. Salt Spray Tested To 400 Hours. A Non-Cr Cr3+ Yellow/Zinc Plated Surface Is Environmentally Friendly. A Deep Torx Compatible Head Ensures Reduced Cam-Out Higher Torque Levels And A Firmer Drive. Patented Self-Drilling Thread - No Pilot Hole Needed. Torx Compatible Insert For A Higher Transmission Of Power. Patented Drill/Drive Shank For Faster Drive Reduced Splitting And 'Jacking' Of The Timber Increased Pull-Out And Firmer Fix. A Sharp Point For Faster Bite Capable Of Penetrating 0.8Mm Steel. Unique Self Drilling Shank Drives Into Most Substrates -Including Hardwood - With Ease. Hardened Case And Core Give Exceptional Strength. Improved Countersinking From Recessed Ribs. Impressive Pull Out Value And Less Risk Of Working Loose When Used In Substrates That Flex In Use. Flexes To 35° Reducing Likelihood Of Screw Shearing When Used In Substrates That Flex In Use. Ce Approved For Use In Load-Bearing Timber Construction. Free Torx Bit With Every Box.PTDFORDIRFFT520YT