This JBL shaft is for the Elite Magnum Metal Spear Gun. The JBL754E is 54" (1,372 mm) long with a 5/16" (8 mm) diameter and 5/16 mm threaded point with wing so it's ready to go when you are. The threaded end gives you multiple tip options. Having spare parts for your gun or sling is the only way to assure you won't get skunked on a spear fishing trip. Constructed of corrosion resistant 17-4 (spring) stainless each shaft is hand-tuned for alignment then heat-treated for maximum hardness to reduce flex and provide optimum energy transfer. Spear Shaft has a 2 Sling Capacity and makes a great Save-A-Dive Kit item.