Whether you are looking for metric hex keys or U.S. measurement hex keys, Monster Bolts has you covered. We know that everyone has different requirements when it comes to the tools that they need, and we are here to meet those requirements. Monster Bolts offers the highest quality hex keys, made with black alloy steel. These keys are ideal when it comes to situations where extreme strength and hardness are required. When you are looking for nuts, bolts, screws, and more to finish your project, it’s time to shop Monster Bolts. We look forward to helping you!