I can't believe these did not come with screws - but can you at least tell me what size screws? #10 maybe?

We currently do not supply screws with this product because most customers use our range of rivets to install the handle directly into a cabinet. The mounting holes have a diameter of 0.2" (5.2mm). Since we are unsure of your specific installation material and thickness, we cannot recommend an exact screw size. However, if you plan to use wood screws, a #10 wood screw should work.