This JBL shaft is for the Carbine JBLD-7 Spear Gun. The JBL733S shaft is 33" (838 mm) long with a 9/32" (7.11 mm) diameter and has 6 mm threads. 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 2 Sling capacity and makes a great Save-A-Dive Kit item.