機器
aluminum
background
cells
chrome
circle
closeup
collar
connection
construction
disk
element
equipment
fasteners
flat
foundry
glitter
group
hardware
heap
hole
industry
iron
junkyard
machinery
material
mechanic
mechanical
metal
metallic
monochrome
order
part
pattern
pill
pin
pitch
recycle
reflection
ring
shape
shim
shiny
silver
slim
stainless
steel
tool
washer
washers