H-Series is specifically designed for grinding hard concrete 

H-Series is specifically developed for hard concrete (Mohs scratch test between 5 and 7). For power troweled surfaces the H-series could be a good choice. The H-series can also be suitable for processing of natural stone such as marble and terrazzo.

If you are looking for metal grinding segments for Extra Hard, Medium or Soft Concrete, try HTC:

H2 Gold
EZ H2 Gold (DS) - 25 grit
Item Number: 593340601

A very efficient segment for grinding concrete. Recommended for normal to hard concrete.

H2 Gold
EZ H2 Gold (SS) - 25 grit
Item Number: 593340602

A very efficient segment for grinding concrete. Recommended for normal to hard concrete.

H3 Grey
EZ H3 Grey (DS) - 40 grit
Item Number: 593340701

A slightly finer concrete segment that also works well for paint removal. Can be used as step 1 on very hard concrete.

H3 Grey
EZ H3 Grey (SS) - 40 grit
Item Number: 593340702

A slightly finer concrete segment that also works well for paint removal. Can be used as step 1 on very hard concrete.

H4 Brown
EZ H4 Brown (DS) - 80 grit
Item Number: 593340801

A slightly finer concrete segment used to remove scores after rough grinding.

H4 Brown
EZ H4 Brown (SS) - 80 grit
Item Number: 593340802

A slightly finer concrete segment used to remove scores after rough grinding.

    H5 Black
    EZ H5 Black (DS) - 150 grit
    Item Number: 593340901

    Gives a score-free surface after H4.

      H5 Black
      EZ H5 Black (SS) - 150 grit
      Item Number: 593340902

      Gives a score-free surface after H4.