All pictures represent actual product. The flat head is cone shaped for use in countersunk holes and has a flat top that fits flush with the mated surface. Socket screws hexagon drive for tightening with an Allen-style wrench. This screw carries a recessed internal socket drive to add strength. The 18-8 stainless steel material provides strength and offers good corrosion resistance in many environments. The material may be slightly magnetic. Flat socket cap screws are threaded fasteners that have a cap head with an internal socket drive for installing in areas with limited side clearance.