I wasn't expecting too much for the price but I had thought these would at least be matched to within .0005, even a novice on a worn out grinder can hit that tolerance. The set I received deviated from each other by .002 measuring over a 1/2" class X gage pin in the vee with a .00005 indicator. Not a matched set by any means. Both blocks were out of square and parallel by .0013 to .0038 and the vee was out of parallel to the bottom by .001. Ok for drill press work but useless for any sort of even medium precision work. Not worth my time to regrind them so back they go.

V-blocks are great for the money and for small hobby mills. The clamps are okay.