These SPAX screws are specifically designed for MDF. The screws have a T15 Torx drive for excellent torque, a special 'arrow-point' which allows the screw to be driven close to the edge of the work, nibs under the head of the screw, and are available with an electro zinc plating. No pre-drilling is required in most materials. They will not break. SPAX screws are an instant solution for almost any construction project.