The unique shape of the EXCEL-550 screw (specified thick plate) gives it “High strength”,“Super Toughness” and “High corrosion resistance” mechanical properties. This product is a Non-circular & Low torque self drilling screw and enables tapping, drilling of the pilot hole, and fastening all in one smooth motion. It is easy to bite, stamp and fasten thick plates due to a unique drill point design and non-circular thread shape. EXCEL-550 (specified thick plate) makes it possible to reduce working time and fastening costs due to improved working efficiency because of its unique shape.