These pins are fantastic in securing items where safety is of the utmost importance. Based on my observations, they are made of sturdy marine stainless steel, ensuring that they are durable and can withstand even the harshest of environments. The locking mechanism is easy to operate and provides that extra level of security. One downside would be that they are slightly pricier compared to other pins in the industrial and scientific category, but the quality more than makes up for the cost. Highly recommend these pins!