Double Countersunk head reduces the likelihood of head sheer and assists completion of countersinking New patented molecular lubrication is designed to enhance screw insertion time and provides greater resistance to corrosion 40 degree deep single thread provides a secure fixing with high pull-out resistance A 25 sharp point assists with easy penetration Special thread configuration gives an ultimate performance and an exceptionally high pull-out resistance Surface hardened up to 750 HV to prevent torque shearing Made form stainless steel for the ultimate corrosion resistance, Manufacturer: TIMco