機器
assorted
background
bolt
build
chrome
closeup
construction
element
engineering
equipment
fasten
fastener
fix
gray
group
hardware
home
improvement
indoors
industrial
industry
iron
manufacturing
many
mechanic
metal
metallic
nobody
nut
repair
screw
shiny
silver
steel
strength
supplies
technology
threaded
tighten
tool
work
workshop