Do items that boost spellcasting help with the Counterspell roll as well?

@JeremyECrawford @SageAdviceDnD Do items that boost spellcasting (e.g. rod of war mage) help with the Counterspell roll as well?

— MovemberCzech (@LowWisdomCzech) November 12, 2016

Wand of the war mage grants a bonus to your spell attack rolls. An ability check isn't an attack roll. #DnD https://t.co/AuQXTtctJ3

— Jeremy Crawford (@JeremyECrawford) November 14, 2016