These screws are a phillips pan head screws made to be used with a phillips screw driver. A slightly rounded head with short vertical sides and an X shaped recess for a phillips screw driver. These screws will not rust, because they are 18-8 stainless steel. They are sold in packages of 50 screws per pack. They have a rounded head to help protect your horses if they were to rub up against your fencing insulators and the screws. Enjoy years of less maintenance and beautiful fencing with these non-rusting heavy-duty screws.