Doublestar Spanner Wrench for Castle Nut Style Locking Rings Out of stock. Check back later... Price: $12.59 Notify me when this item is back in stock (log in required) Description Details Reviews Shipping info AR-15 Spanner wrench for Colt castle nut style locking rings. UPC: 841348100485Manufacturer: Doublestar CorporationModel: AR753NCategory: ToolsOtherStock: 0Unit/Measure: ea This item may be shipped directly to your home address, unless you live in a restricted state.