Spiral Fluted Mini Bolt Knob Spiral Fluted Mini Bolt Knob 1.200” Overall Length – 0.750” Outside diameter at the largest point 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 8 Spiral flutes for superior grip while not snagging Satin Black Explore Firearm Solutions – J&A Outdoors
