GrovTec US Angled Loop Recessed Plunger Heavy Duty Push Button Swivel Set Black. Recessed plunger to avoid accidental opening when using hook type attachments. Specifications for GrovTec US Angled Loop Recessed Plunger Heavy Duty Push Button Swivel Set: Manufacturer: GrovTec US Color: Black Fabric/Material: Steel Gun Type: Rifle Gun Model: Universal Package Contents: GrovTec US Angled Loop Recessed Plunger Heavy Duty Push Button Swivel Set GrovTec US GTSW263: Angled Loop Recessed Plunger Heavy Duty Push Button Swivel Set Black