These ‘V' Blocks have two ‘V’ angles of different sizes to take jobs of different measurements. The clamps help the work to be held rigidly to the ‘V’ block. The top ‘V’ and the bottom ‘V’ are parallels with ± 3 micron and its square ness to the end faces and the height variation to the ‘V’ Block in pair is within ± 3 microns.