This Anderson Tactical Replacement Bolt Knob from Pacific Tool & Gauge provides plenty of clearance for large rifle scopes and aids in faster manipulation of the bolt. Milled from aluminum to an overall length of 1.25" and aggressively knurled for a sure grasp, the Anderson bolt knob features a 5/16"-24 thread that is compatible with PTG threaded bolt handles and Surgeon actions. Gunsmith installation may be required. Made in the USA.