The Official Online RBS 6 Nations Store is open. The store has everything you need to get behind your team during the RBS 6 Nations, plus the store is now fully stocked with a much wider range of rugby merchandise.
“It's just great to be in the final,” he said.
“It feels great, I thought we deserved it - fair play to the boys, they dug in and got the win.”
Winger Williams scored a controversial first, sneaking his way into the left corner despite appearing to step narrowly into touch.
His international team-mate Dan Biggar slotted the conversion but the home side were guilty of a lack of cutting edge as they were frustrated by a determined Glasgow outfit.
Glasgow got themselves right back in the game when hooker Fergus Thompson crossed in unusual circumstances after his overthrown lineout made its way back to him via a Marty Holah knock-on.
But Hook’s superb individual effort to chase down his own blind-side chip ahead confirmed the Osprey place in the final.
Williams admitted his side were far from their best but praised a dogged Glasgow performance.
“It's always tough against Glasgow, they didn't come here to lie down and they've been tremendous away from home all season.
"We made far too many mistakes in critical areas, but a win's a win.”