These 100 sets of 9mm bullet cone metal screws are ideal for DIY leather crafts and embellishments. Designed for easy application, they feature a screw-back mechanism that requires no special tools or metal-dies. Each spike is meticulously finished, smooth, and free of casting lines, ensuring a polished appearance. The plating and color are durable, resisting fading and tarnishing over time, maintaining their vibrant look for years. Historically, studs and spikes have been used by samurais, Celts, and Romans, and today they are a popular fashion trend, appearing on jackets, tops, pants, shoes, leather goods, and bags. These versatile spikes allow for creative expression across various projects. Each set comes with a convenient zip storage bag, and the product includes a 60-day warranty with options for refund or replacement. Slight color variations may occur due to lighting and monitor settings.