K-AT stands for Knife-All Terrain. It is a sheath and neck knife combination. The blades are BG42 steel. The sheaths were built out of urethane so that they could be taken apart to be used as a neck knife. There is also a lanyard wrap incorporated into the design so that the lanyard may be stashed when not needed. The sheath also incorporated a built in sharpening stone in the center. This design was licensed to CRKT, click here to see the factory version.