New JBL 3/8" (9.5mm) Stainless Steel Spring Slide Ring for JBL Spearguns with 3/8" Shaft (AP-528) JBL 3/8" (9.5mm) Spring Slide Ring Constructed of Durable & Corrosion Resistant 17-4 Spring Stainless Steel 3/8" (9.5mm) Diameter Connects Shock Line to Spear Shaft Prevents Loss of Speargun Shaft