It's hard to find a well designed set of vise jaws.
 
My problem was that I couldn't find a set of jaws that could tolerate high heat and stay firmly on the vise.  Simply bend the side tabs along the right perforations to fit your vise width.
 
This set of jaws features:
Side "wings" to keep vise in place
Fits 3.5-5.5" vises
Balanced design
6061 aluminum construction; soft enough for most applications