aluminum

background

bar

bars

blue

building

chain

close

construction

couple

couplers

cut

cutting

drill

duct

engineering

equipment

factory

focus

gas

girl

grey

grinding

industrial

industry

iron

labor

laptop

left

light

machine

manufacturing

many

metal

moving

pan

pipe

pipes

plastic

pull

right

rod

safety

securing

slider

spark

steel

tilt

tool

using

valves

warehouse

welding

worker

workers

working