Recessed Double Contersunk Head with Sharp Milling Ribs Sharp, Wide & Deep Thread featuring Sawfix Technology Oblique-angle Sharp Gash Point Zinc & Yellow waxed Vortex - the multi purpose power screw is technically advanced, including 'Sawfix' technology, which quickly and easily powers through a wide range of materials, including hardwood, decking, MDF, plastic, sheet metal and many other applications. All Vortex screws are CE compliant.