SEVEN SINS CHOPPERS Original "DIRTY FRANK" Breather bolt. Inspired by the neck bolts in Frankenstein's neck we decided to do our own spin on some engine breather bolts. These STAINLESS STEEL beauties have a hidden internal machined key area for tightening and feature all stainless hardware and a filter element. These ship with a machined finish with a custom 1/4"NPT Thread. Sold Individually.