Deep #2 Tower Jaws for the Oneway Stronghold Chuck.  Gripping range internal is 2" to 3 3/4".   These have "Profiled Jaws" for greater holding power and larger gripping surface than even the serrated or smooth jaws.
A deep jawed set of jaws for the Oneway Stronghold Chuck, in a "Profiled" version--giving greater surface contact through all ranges of diameters..  Gripping range internal is 2" to 3 3/4", while the jaws will expand into an opening range of 2 3/8" to 4".