機器
alloy
background
bolt
chrome
closeup
construction
element
engineering
equipment
fastener
group
hardware
hexagon
horizontal
indoors
industrial
industry
iron
many
mechanic
mechanical
metal
metallic
new
nobody
nut
objects
part
pattern
repair
repairing
screw
set
shiny
silver
small
solid
stainless
steel
still
strength
texture
tool
variation
work