Are you going for a modern look? Maybe posting some pix of your kitchen would help. Also, look at pictures of kitchens that you like and see how they did it. 6-3/4 sounds kind of long to me, but you may like the look.

We used single large pull on all drawers other than the spice pull outs. We liked the look, much preferred it to the two pulls that may use.

Its a preference thing, like jewlery.

Here are the large pulls
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Here is one of the smaller
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Overall look
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My neighbor and I have the same cabinets made by the same cabinet maker. She has large brushed silver bar pulls--maybe 8". My pulls are matte black and a full 6" long.

This single difference makes both of our kitchens seem distinctively different. (Vertical on cabs & horizontal on the drawers) They don't seem large at all on either.

As for the placement, I've seen so many variations on this forum. I don't think there are any rules regarding knobs & pulls.

My advice to you is try it the way you want it. It's not hard to figure out if you like it or not and it's your kitchen, so you're the only one who has to love it.

debsan - Can you post pictures of your pulls installed? Thanx!