Small jaws for small projects. Nominal outside dovetail 25mm diam. Inside grips down to 13mm and up to 35mm. Outside grips 24mm up to 46mm. Projects further out than the 25mm jaws so will grip inside a 25mm hole eg inside of peppermill body.
Will grip square section pen blanks for drilling.
Detail here with one jaw removed shows jaw dovetails inside and out. The most popular extra for the Patriot.