The four flukes anchor made from stainless steel 316, wear-resisting, anti-corrosion, anti-rust,strong and durable. The Grappling Hooks are best for outdoor sports, It is a essential tools.Perfect for climbing activities, wilderness survival activities, outdoor adventures, climbing tree, climbing mountain, rock climbing , ice climbing, anchoring, fishing,disaster relief,cleaning up the weeds, pull down tree limbs,grapple falling objects,etc.