German-English translations for stehvermögen

• grit
  The flower beds were white with grit from sand blasting the flagstone walkways
  These cookies seem to have grit from nutshells in them
  I need a sheet of 100 grit sandpaper
• stamina
  In that connection, I should also condemn the lack of stamina shown by the groups on the Left. In diesem Zusammenhang muss ich auch das fehlende Stehvermögen der linken Fraktionen beanstanden.
  To reach an effective international agreement, we will need stamina and patience as well as a lot of political will. Um ein wirksames internationales Übereinkommen zu erreichen, benötigen wir Stehvermögen und Geduld sowie eine Menge politischen Willen.
  He has a lot of stamina. I suppose thats why he can run for a long time.