Having spare spear shafts on hand when out on the hunt is just good sense. Don't let a damaged spear shaft ruin a day or multi-day Hunting Trip. Spare parts for your gun is the only way to assure you won't get skunked on a spear fishing trip. Cressi SL/Star Shaft is constructed of corrosion resistant cadmium plated 8mm (0.31") stainless steel each shaft is made to last. Be sure to have a spare shaft on hand for your SL/SL Star Pneumatic Spear Guns so you will always be ready to fish. Shaft has 7mm threaded end for Cressi Spear Tips. Spear shaft makes a great safe-a-dive kit item.