The double enders are often for metal, but I have one made for woodworking. Its the same thing except larger and with rosewood slips on the steel middle.
Actually, any knife you are comfortable with, that allows you access to mark a line where you need to, is a layout knife.
I have some. I've made some. Used "other" knives too.
Everyone has their favorites. A person is supposed to try out lots of styles and eventually pick your own favorites.
A knife line is finer than a pencil line. Good to put a chisel right in, for the final paring pass too bring a part, whether mortise or dovetail, whatever, to final size.
Not as easy to see though. Some guys use a knife and then rub chalk in the mark for better vision.
If a sawcut is especially crucial, its common practice to cut the line where you need it and then cut a second parallel angled line in the waste side, over to the original line. This cuts a little strip of wood free.
It makes a little trench to lay the saw in.
This always works and makes the sawcut very accurate,
but its slow and too fussy for regular work where a pencil is close enough.
A person need to be able to lay out and work very accurately at times (where it shows), and also to casually lay out and work fast at other times. (where the sun don't shine)
And learn to know the difference.
yours Scott
