These M8 mounting T-nuts are made of 316 stainless steel which is more durable to be attached to your kitesurfing equipment. It is more rigid than brass nuts and will certainly be tightened like a rock, so it keeps the tension on your equipment manageable for lasting use. The best thing about these nuts is that it does not rust and it is so fitting to be used on your equipment while you surf freely the seawater. It is high-quality performance even after years of use, these T-nuts with screws will still look new and still durable.