304 stainless steel with 1/4-20 threads. Sold with flanged black oxide lock nut.
Fits 38mm Plugged/Smoke Bulkheads, 54mm Standard and Extended Bulkheads only.
Thru hole ID has been opened up to 0.282". These beauties take up about half the space of a standard 1/4-20 eye bolt.
Shown on left.