GrovTec US Metric Thread Protector 15x1 Black. Features quality steel construction and premium black-oxide finish. Specifications for GrovTec US Standard Thread Protector: Manufacturer: GrovTec US Color: Black Gun Model: Universal Fabric/Material: Steel Quantity: 1 Finish: Oxide Package Contents: GrovTec US Standard Thread Protector What firearm models does the manufacturer say GrovTec US Standard Thread Protector is compatible with? The manufacturer suggests that GrovTec US Standard Thread Protector is compatible with UniversalGrovTec US GTHM250: Metric Thread Protector 15x1 Black