When no marks on the workpieces are permitted, smooth jaws are employed.
BK2-VT-S is an analogue of BK2-VT, with the same key features and measurements, except that it comes with the smooth jaws.
The DK2-VT-S is an analogue of DK2-VT, with the same key features and measurements, except that it comes with the smooth jaws.
The inch model code is DK2-VTI-S.
The FK2-VT-S is an analogue of FK2-VT, with the same key features and measurements, except that it comes with the smooth jaws.