Like Download 1.37 MB Big mill cog 6016 x 4016 pixels Aspect ratio 376:251 NIKON D610 85 mm f/3.5 1/200 s ISO 1000 Online since: 22 October 2017 Taken: 21 October 2017 CC0 / Public Domain machine mill industry steam milling machining tool equipment industrial metal factory technology engineering workshop steel precision processing mechanical machinery heavy process manufacturing