These hex caps come in metric sizes ranging from 5mm to 8mm. They all are also made from stainless steel A2 for strength and durability! When it comes to finding the finest hex caps, screws, nuts, bolts, washers, and more, you need to shop Monster Bolts. We know that your project takes special tools and materials to ensure that it turns out the very best in can be. Contact us today if you have any questions or comment about our products. We look forward to helping you and seeing how our products can assist you in your work!