Spear 4:
Spear head length: 7 in. / 18 cm (to the end of the two barbs)
Width at widest: 1 1/8 in. / 3 cm
Ferrule/socket length: 7 in. / 18 cm (including barbs on ferrule)
Ferrule/socket diameter at shaft: 5/8 in. / 1.5 cm
Notes: Iron coil at base of shaft. Well-balanced - I'm guess a throwing (hunting) spear? Spears 5 & 6 are very similar to spear 4 (moreso 5 than 6), sharing general dimensions (both spear head and spear OAL), incised designs, and the same squared-off cubic element on the socket.
Spear 5:
Spear head length: 9 1/4 / 23.5 cm
Width at widest: 2 1/4 / 5.7 cm
Ferrule/socket length: 21 1/4 / 54 cm
Ferrule/socket diameter at shaft: 5/8 / 1.5 cm
Notes: This is the lone African spear I already owned. At least I presume it's African. Spike opposite spear head measures 35 inches.