英文關鍵字
washer
puck
shim
collar
spacer
rove
hub
nave
boss
hob
steel
object
metal
mechanic
isolated
industry
repair
tool
industrial
rotating
equipment
manufacture
background
engineering
white
turn
closeup
service
spin
stainless
tight
silver
tools
part
rotate
hardware
hex
threaded
technical
installation
chrome
fastener
new
iron
metallic
fix
diy