High Quality Material: This weight stack pin is made of durable solid steel, safe and reliable, with a black coating to prevent product corrosion and rust. Product Features: Our weight stack pin is simple and easy to use, just insert it into the weight stack machine and adjust the weight according to your exercise needs. It can help you strengthen your workouts to achieve fitness goals and gain better body shape and muscle strength Product Specifications: The package includes weight pins and spring clip collars. The weight stack pin counterweight area is designed for 2-inch Olympic barbell plates to help your weight machine load extra Olympic weight and let your muscles continue to accept new challenges!