Product review (5 stars): 100% perfect replacement!
Perfect.  Fit my 8-year old dryer perfectly!  As another buyer said - MUCH better than using pliers!  Took all of 1.4 seconds to install.  Most of that time was spent looking at the socket to ensure the flat side of the "D" socket aligned with the flat side of the post.

My old knob had broken as the plastic socket finally wore down over time and cracked, allowing it to slip around the post instead of rotating the post.  This replacement has the necessary "D"-shaped socket.