Working with stainless steel wire rope? These copper ferrules are used to create loops or join ends securely. They're oval-shaped, sized for 5mm diameter wire rope. Each ferrule is about 18mm long with inner dimensions around 11x5.5mm. You'll need a crimping tool (like a swager) to compress them onto the wire - they're not for hand tightening. Once crimped, they form a strong, permanent connection. Great for DIY projects, rigging, fencing, marine uses, or crafts. Copper is soft enough to crimp well but strong when compressed. Pack of 10 gives you extras for practice or multiple projects. Always use proper safety gear and techniques when working with wire. Check your wire diameter matches before buying. A basic supply for anyone doing wire rope assemblies. Professional results at a hobbyist price. Note: Tool not included. Familiarize yourself with crimping methods for best results.