GrovTec US Thread Protector Converter Black. Specifications for GrovTec US Thread Protector Converter: Manufacturer: GrovTec US Color: Black Gun Model: Universal Threads per Inch: 5/8x24 Fabric/Material: Steel Finish: Oxide Package Contents: GrovTec US Thread Protector Converter What firearm models does the manufacturer say GrovTec US Thread Protector Converter is compatible with? The manufacturer suggests that GrovTec US Thread Protector Converter is compatible with UniversalGrovTec US GTHM197: Thread Protector Converter Black