GrovTec US Non-Detachable 1in Machine Screw Black. These Swivels from GrovTec US bring back the old-school aesthetic of a gun sling swivel without affecting the swivel's functionality. In fact the GrovTec GT Locking Swivel delivers the same secure attachment system found on most hinged rifle stocks but with the ability to quickly attach and detach with only one hand. The locking mechanism of the GrovTec Non-Detachable Swivel offers a solid "click" when the metal engages making it incredibly easy to remove and attach these swivels. Install the GrovTec Locking Swivels today to experience the difference that true craftsmanship can make. Specifications for GrovTec US Pump&Auto Shotguns Non-Detachable Locking Swivel Set: Manufacturer: GrovTec US Color: Black Fabric/Material: Steel Package Contents: GrovTec US Pump&Auto Shotguns Non-Detachable Locking Swivel Set GrovTec US GTSW76: Non-Detachable 1in Machine Screw Black