This JBL shaft is for the Mini Carbine Spear Gun and comes equipped with a point and wing so it's ready to go when you are. This JBL724SB shaft is 24" (610 mm) long with a 9/32" (7.11 mm) diameter. 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. Shaft has a 1 Sling Capacity and makes a great Save-A-Dive Kit item.