Head: 11oz to 1lb-6oz (depending if hammer-pole or not).
(some might not consider a hawk with a pole a hawk ... that's kinda specific though)
Haft: Longer haft for heavier head.
Max. 22" haft (total including outside head)
Min. 18" haft (unless something specialized)
Hawk that lives on outside of my pack is 11oz Head on 18" Haft (same hawk used in bow-drill fire-start video, and the planking photos below).
Hawk Bench - Bench plank, support rounds, shelf in foreground sectioned & finished with tomahawks. This was a great project to see how the different hawk head designs and edge profiles performed in this type of work. I was pleasantly surprised how well the tomahawk works as a wood-plane for finish surfacing.
Hawk Bench Planing - Visible references to the bow-saw-kerf used to establish overall depth of stock removal and flatness with the tomahawks.
Hawk Batoning - Batoning with a Hawk to section cedar for planks. Dings in haft are from hawk throwing and bit dislodging & sliding down haft.
Firestarting:
[video=youtube;MK0A0rUQN2Q]https://www.youtube.com/watch?v=MK0A0rUQN2Q&t=230s[/video]