See my picture below. The drawers in that picture are 19.5" across from inset edge to edge and I used (1) 4 inch pull on each. Feels fine and looks good IRL. I think 4" would be too big.

I doubled them up for a wider drawer (30 inches wide)

How do the 4" pulls FEEL in your hand? I have a few of that size and find them pretty small. I'm not sure I'd want them all over my kitchen. My 6" and 8" pulls are much easier to use. YMMV.

YMMV=?

My kitchen has a more contemporary vibe so I went with various sizes of pulls on all my cabinets and drawers. I love having wider pulls so easy to get any size hand around them. Just to help you visualize here are a couple pictures of my pulls.
This first picture is a 6-1/2 inch pull on a 13 inch drawer:

Here is a 10 inch pull on a 18 inch drawer:
{{!gwi}}

This post was edited by badgergal on Mon, Feb 4, 13 at 21:14

Your mileage may vary

My advice is definitely to err on the side of too narrow. And, I don't think 4" is too narrow, certainly not for a 16" drawer.

YMMV=Your Mileage May Vary

The drawer stack next to my fridge is 16" and the pull is 5 1/2". The Siena is actually 3 3/4", but I would go with that before I'd use an 8".

Thanks all...I ended up deciding to do an oval knob on both those drawers, thought it made things a little more interesting and solved my debate b/c I was just not loving the smaller pull on there. I agree the small ones are too small... I'm only using them on 4 narrow drawers on my island & using the oval knob on the top drawer of each 3 drawer stack so that will be sort of consistent anyway.

I think big pulls give a more contemporary look although Schaub Siena is very traditional.

This post was edited by lilymila on Wed, Feb 6, 13 at 1:05