This is the lanyard ring part from Seizo Imai's "Imax" Survival knife. It also fits the Buck 184 Buckmaster. Back in the day, Imai made the best quality Japanese made Buckmaster style knives for Explorer and Parker. Measures 0.19" thick x 0.963" in diameter. A great replacement part for one of the vintage Japanese Buckmaster style knives or replace a lost lanyard ring to a Buck 184. Seizo Imai was one Seki, Japan's finest craftsmen and most famous knifemakers of the modern era. His collaboration with Parker spanned nearly two decades. He made knives for Parker, Frost, Browning, Explorer, Compass, Condor, and many others, including his own brands Imax and Seizo Imai. His custom Loveless style knives are works of art. After his passing, several vintage old stock models were found at his warehouse. This is one of these rare finds. Stock photos.