How to use .fromAxisAngle?

So I have a part and Im just testing with CFraming but I discovered the method FromAxisAngles and I was wondering how I use it. This is my code

local Part =  game.Workspace.Part
while true do
Part.CFrame = Part.CFrame * CFrame.fromAxisAngles(--Don't know what to put here.)
end

It would really help how to know. :)