Tactical Titanium Bolt Knob 5/16" x 24, Ruger Precision, Grenade Style Tactical Titanium Bolt Knob 5/16" x 24, Ruger Precision Titanium replacement Bolt Knob for the Ruger Precision or any with 5/16"x24 thread Unique grenade cut design. Highest quality, Lightweight, extremely durable, tumbled finish Made in USA