The length of Viking spearheads ranged from 20 cm (8 in) to 60 cm (24 in). Some spearheads had ‘wings’ at the base of the socket. These wings limited the depth of penetration of a spear thrust, as well as catching or hooking an enemy’s weapon, shield, or body part. The small metal wings were formed or welded onto each side of the base of the spearhead.
According to the sagas. Winged spearheads could be used very effectively to parry, trap and block an opponent’s weapon. When the wings were sharpened, they were lethal when being thrust forward and when pulled back.
Normal spearheads with wings were called Krókspjót (hooked spear), from Old Norse krókr, meaning "hook” or “anything crooked", and spjót, meaning spear. Larger-headed spears were called Höggspjót, (hewing spear), from Old Norse högg, "stroke, blow, slaughter, beheading", and could also be used for cutting.
The first choice of wood for a Viking spear shaft was ash. This wood is hard and strong and grows naturally straight. Viking spear shafts were usually shaped round, with a diameter of 2 to 3 cm (1 in). There was no regulation for the length of a Viking spear shaft, but a shaft of around 2 meters (6 feet) makes for a fast and well balanced weapon when used in combat and when thrown.
Anywhere between 2 to 3 m (6 to 9 feet) results in a spear that can be used effectively in combat. Any shaft shorter than 2 meters loses the ability to keep an opponent at least a whole pace away. Any shaft longer than 3 meters makes the spear clumsy and heavy.