Like Download 9.84 MB Construction helmets 4830 x 3178 pixels Aspect ratio 345:227 NIKON D7000 50 mm f/4.5 1/100 s ISO 250 Online since: 21 November 2016 Taken: 20 December 2015 CC0 / Public Domain construction helmet colorful pattern industry work worker safety engineer builder project industrial professional equipment construction site build contractor hardhat