Just finished this up in my shop.  The wood was 3/4" oak, but over the years it weathered down to 5/8".  I have wire brushed the wood and applied a coat of matte finish to seal the wood.  Overall the shelf is 24" wide, 10" tall, and 3 3/4" deep.  The shelves are 18 1/2"" wide, and 3" deep.  I placed felt bumpers on the back to protect the wall it is placed on. 

Shipping is exact cost (6 lb 3 oz) from zip code 45601.

If you have any questions, feel free to ask.