No matter what brand spear gun you own JBL Adapters allow you to match up just about any tip to shaft configuration you can imagine. JBL adapters are constructed from (303) stainless steel to help resist corrosion and give a lifetime of durable use. This JBL spear tip adapter has 5/16" female threads to 6mm male threads. So add versatility to your arsenal if one tip you really prefer is not matched with your spear shaft JBL has an adapter that can make it work. Spear tip adapters make a great save-a-dive-kit item.