automatic release mechanical firing head

combination firing head

firing-head

hydraulic firing head

pressure firing head

sure-fire firing head

tank over-head firing

tripped firing head

hammer head [= hammer head shark]

head to head

head to head configuration

head to head structure

head wind [= head sea]

head-to-head

head-to-head polymer

hexagon socket countersunk head cap head screw

hexagon socket head cap head screw

Round head rivets with small head--Black

snap head rivet (round-head rivet)