background
bond
chain
chained
close
closeup
color
concept
conceptual
connect
connection
detail
equipment
fetter
freedom
green
heavy
idea
image
industry
isolated
join
line
link
lock
metal
object
pink
plastic
power
red
ring
robust
row
secure
security
series
shackle
shape
shiny
steel
still
strong
symbol
together
tool
unite
yellow