Case XX Jigged Rough Black® Synthetic RussLock® 18224Jigged Rough Black Synthetic RussLock Folding Knife Model #18224 The Jigged Rough Black Synthetic RussLock Model #18224 is a rugged, American made folding knife built for reliability and everyday performance. Part of the Rough Black Family, this virtually indestructible synthetic handle design draws inspiration from the Gum Fuddy knives carried during World War II. Named after Case founder J. Russel Russ Case, the RussLock pattern combines tradition