4 in High Precision Swivel Milling Machine Vise

Pro-Series 4″ Milling Vise Swivel Base (3900-2234)
Precision ground to accuracy.
Full 360° swivel base with graduation included.
Fits our vise #3900-2224.
The channel where you mount the vise has a 1/2″ slot.
The outer diameter is 5-3/4″.
The inside diameter is 4-3/4″.
The center pin is 0.78″.
Mounting bolts are included.