This is the Stainless Steel Rotating Long Wing Rock Point Tip for Scuba Diving and Freediving Spearguns Features: 17-4 Hardened spring stainless steel point 4 Inch (102mm) Wing Span Multi-purpose point for small to medium fish Standard 3/8" (9.5 mm) profile opens larger hole for easy passage of barbs through fish Wing retainer allows easy removal from fish Short-tapered, machine-cut point Optimal Use: Open water, reefs and rock Rotating design allows for 360 degree spin, providing greater holding power and minimizing the chance of your point unthreading from the shaft as a result of a fish "rolling" in battle."