This slip is designed to fit the Most Jack Wolf models, Spearpoint and Wharncliffe Ohio River Jack, The Kingspin by NotoriousEDC, Certain models of the Hedgehog by QSP Knives, The Sodbuster JR, The American Bladeworks Slipjoint, and many more knives with a similar size, including most single blade knives with a closed length up to four inches.)