To answer the question if metal knives found in late Bronze Age deposits in Karmin in W Poland (ca. 900–800 BCE) could have been used as multi-tools in processing hard materials like red deer antler and animal bone, we applied an experimental method followed by the use-wear analysis of a replica of late Bronze Age bronze knife. This is the first experiment that focuses on the tool instead of the processed material. It included five movements engaging various sections of a knife blade and tip and producing diversified traces depending on the type of technique and raw material worked. We showed that an adequately cast knife, hardened then by cold working, could have been applied in all stages of manufacturing antler and bone objects, from initial material division (cross-cutting) over shaping (surface cutting, whittling) to finishing (scraping, drilling). Although the tool required frequent resharpening, it efficiently performed various movements. The traces on the replica, such as U-shaped notches, chips, blunting, bows, scratches, and serrated and wavy edges, correspond well with those observed on the knives from Karmin.