Karambit Knife 4 3D model is available on CGTrader for $7. Original author: faraharis. Specs: 510 polys, 537 verts.
BLEND (Blender, filesize: 1.07 MB), BLEND (Blender, filesize: 1.07 MB), OBJ (OBJ, filesize: 43.8 KB), FBX (Autodesk FBX, filesize: 40.7 KB), 3DS (3D Studio, filesize: 17.1 KB), DAE (Collada, filesize: 61.7 KB)