aluminum

angle

assurance

background

bar

blue

building

cap

check

checking

close

construction

couple

coupler

couplers

cutting

device

duct

electric

engineering

equipment

factory

focus

grinding

industrial

industry

iron

labor

light

list

locking

machine

making

manufacturing

metal

moving

notes

packing

pen

pipe

preparing

product

pull

quality

reinforcement

rod

safety

side

slider

spark

steel

tool

warehouse

welding

worker

working

yellow