See here for the hacksaw blade preparation common to both my hacksaw knives.
The handle was made from pieces of jarrah given to me by my brother-in-law who lives in Australia. From his work in overhead electricity distribution he had access to jarrah crossarms that were being replaced. I love the provenance of these and the idea that they had been outside in the Australian bush in all weathers.
The knife was really hard to photograph well but there are a few attributes of the handle that I was trying to illustrate:
The handle is rounded for comfort, particularly the end that pushes into the hand;
One particularly distinctive feature is the way the handle meets the blade. Rather than flowing smoothly into it, the top of the handle makes a sudden downward turn just behind the blade, before relaxing into the much gentler curve of the grip;
The cross-section of the handle is that of a flattened oval so that the flat top allows the thumb to fit comfortably along it.