JBL Mini Carbine Series Spearshaft |  | The 722-S Shafts are all made of 9/32 inch diameter hardened spring stainless steel and is 22 inches inches. length.Replacement shaft for the JBL Mini Carbine speargun. | |  | JBL Shaft 4D49 Speargun |  | The 742-S Shafts are all made of 5/16 inch diameter hardened spring stainless steel and is 42 inches in length. Replacement shaft for the JBL 4D49 speargun. | |  | |