Helical Fluted Large Bolt Knob Helical Fluted Large Bolt Knob These Knobs are made of 7075 T6 Aircraft Grade Aluminum 2.0″ Long 0.875″ Major Diameter Tapered up from a 0.380″ diameter at the threads These feature 5/16-24tpi threads that are 0.650″ deep with a .100″ recess These also feature 6 Helical flutes Explore Firearm Solutions – J&A Outdoors
