Hardened steel jaws, X-large C-clamp, vertical adjustment. Includes small/large jaws and stem extender.
For reference, the Terra Silverado vise fitted with the small jaws will consistently hold an Eagle Claw 570 4/0 hook (.039" wire diameter). The large jaws will hold an Eagle Claw 635 3/0 (.050" wire diameter) hook. The jaws on this vise have a small notch that reduces jig movement/slippage while tying.