Radical Grace/the Lutheran Difference

In this edition of Radical Grace Radio Pastor Greg does a mean Sean Connery impersonation as he makes a great point about the love of God, and we answer an emailer who wanted to know...There's something which confuses me about Sola Fide.  If we're saved by grace alone through faith alone by Christ alone on the authority of scripture alone, why are sacraments necessary?  I'm not necessarily doubting the necessity of sacraments, I just don't understand that if access to salvation comes down to faith alone (sola), then how is it alone if a sacrament must be coupled with it?  Thank you in advance for your answer. -Chris Danville, Indiana