This JBL shaft is for Mares, AB-Biller and JBL (JBL4D45) Spear Guns. The JBL731 shaft is 33" (838 mm) long with a 5/16" (8 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.
OEM shafts for JBL, A.B. Biller, And Mares mechanisms are milled to spec for a perfect fit and function. Adapt-A-Shafts are 6 mm threaded on both ends and accept 303 stainless adapters allowing you to customize length for just about any spear gun mechanism available. Spear Shaft makes a great Save-A-Dive Kit item.