Microsoft Word template guides: 

To help you print business cards on Avery 
Business Cards #8377, 2" x 3 1/2" (50.8mm x 88.9mm) 
or similar (10 cards per page) stock.


Replace the "X" place holder(s) with your text.
Replace or delete the image (26.2mm x 26.2mm).
PRINT on the card stock.

Use with my compliments. 


(This is an empty table with bold borders)

Fill in your text.
Change the [Table -> Borders and Shading] as required.
PRINT on the card stock. 

Adapted by Russell M. Middleton from original source: