機器
aluminum
background
blank
bolt
brass
closeup
construct
construction
design
detail
element
frame
gear
gray
grunge
hardware
head
hole
illustration
industrial
industry
iron
isolated
mechanic
metal
metallic
modern
old
part
pattern
pinion
plate
rusty
scratch
screw
sheet
shiny
silver
stainless
steel
surface
technology
template
texture
textured
tool
vintage
work
workshop