Lockstep Arms Thread Protector 1/2-28 Thread Blue. Chamfered dimples to increase grip for a tool-less install. Includes barrel O-ring. Machined from 6061-T6 billet aluminum with an anodized finish. Available in Black Red Blue Gray Purple and OD Green. Specifications for Lockstep Arms Thread Protector: Manufacturer: Lockstep Arms Threads per Inch: 1/2x28 Fabric/Material: 6061 Aluminum Quantity: 1 Finish: Anodized Weight: 0.05 oz Features of Lockstep Arms Thread Protector Fitment 1/2-28 Threaded Barrels Length .50in Weight .05 oz Package Contents: Lockstep Arms Thread Protector O-ring Lockstep Arms LA-GLK-1100-BLU: Thread Protector 1/2-28 Thread Blue