機器
background
bolt
building
built structure
chrome
circle
construction
coupler
element
equipment
facet
fastening
fit
fix
grained
gray
grooved
group
hardware
head
heap
hexagon
hole
industry
iron
material
mechanical
metal
new
nut
object
part
pile
repair
scattered
screw
spiral
stack
stainless
steel
strong
technology
texture
thread
tool
washer
work