$39 SO Retractable utility knife UTK100 Low-poly 3D model by cgeas. Available on CGTrader with 14794 polys and 15179 vertices. Check it out on CGHub.
MAX (Autodesk 3ds Max, filesize: 4.77 MB), OBJ (OBJ, filesize: 2.16 MB), FBX (Autodesk FBX, filesize: 7.32 MB), MAX (Autodesk 3ds Max, filesize: 4.77 MB), C4D (Cinema 4D, filesize: 3.41 MB), MA (Autodesk Maya, filesize: 3.32 MB), TEXTURES (Textures, filesize: 28.3 MB)