Step jaws are used in expansion mode for internal holding within a straight wall. Normally, these are used holding small items like a box or lid. The serrations grip the work securely (but will not grip it as well as standard dovetailed jaws) with a straight side wall which can be ideal for some projects. Because of the two 12.7mm-high steps this jaw set can provide a massive adjustment range.
These jaws will also close down so that there is no gap at the apex of all four jaws - so they can also be used for gripping miniscule work.
Jaw Travel Expanding - 25 - 102mm
Jaw Travel Contracting - 3 - 59mm