Oneway Profiled Jaws (#4) for Stronghold Chuck Shop By Instrument_Cello increasing cutting edge hardness to

increasing cutting edge hardness to 1880 Vickers (75+ Rockwell C)

as you can have two different grinds or the same grind twice on either end

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made in England

Oneway Profiled Jaws (#4) for Stronghold Chuck Shop By Instrument_Cello increasing cutting edge hardness to#4 Profiled Jaws for Oneway Stronghold Chuck. Chucking capacities of the Stronghold Chuck with Spigot Jaws: External (compression): 4 7 8" minimum, 6 1 2" maximum Internal (expansion): 4 1 4" minimum, 5 3 4" maximum Spigot Jaws for the Oneway Stronghold Chuck are deep to provide a better grip on smaller parts. Both outside and inside surfaces of the jaws are serrated to grip the workpiece. Made in Canada.