Ok, figured it out.  4M Screw 10MM long.  Found at Home Depot - have to look inside the bins in the nuts and bolts aisls.  I also found these on Amazon that may work - [URL]    
I am looking for the screw size for the stand to that holds the computer. Inspiron 24 AIO 5459.  There are 4 holes, think it says M4 on the back but not sure if that is the screw size and how long the screws should be.  Thank you. 
Scews for Stand inspiron 24 5459