Volquartsen Firearms Thread Protector for 1/2 x 28 Threads Stainless. It is machined from a solid 416R stainless bar stock and anodized for long wear life. This protects the outside of your 1/2 x 28 threaded barrel and aids in cleaning as no cleaning can be done without it. The outside of the thread protector is serrated to easily remove/insert your cleaning rod and serves as a bar guide for the cleaning rod. The inside is coated with a fine lubricant to prevent corrosion. Specifications for Volquartsen Firearms Thread Protector for 1/2 x 28 Threads: Manufacturer: Volquartsen Firearms Threads per Inch: 1/2x28 Condition: New Fabric/Material: 416R Stainless Steel Quantity: 1 Country of Origin: USA Package Contents: Volquartsen Firearms Thread Protector for 1/2 x 28 Threads Volquartsen Firearms VC1228T-S: Thread Protector for 1/2 x 28 Threads Stainless