These socket head cap screws all come in U.S. sizing in inches and are made from alloy steel with black oxide. Monster Bolts is your top one stop shop when it comes to finding screws, bolts, nuts, washers, and more online! We know what it takes to create a seamless and durable project. It all begins with the little details. For nuts, bolts, screws and more that will always deliver a job well-done, it’s time to shop Monster Bolts.