AB Marine Shaft Shark, model 500 split unit shaft and saildrive rope cutter, for 2" shaft, 316L Stainless Steel. Attaches to your shaft just forward of your propeller, it rotates with the shaft, cutting away any rope, weed or debris that might try to entangle your shaft & propeller. With no moving parts, maintenance is minimal and the edges can be re-sharpened when necessary.