This is our Pocket Rule. It measures exactly the same as a standard business card or 2" by 3.5". It offers INCRA's patented marking holes at every 1/16th, 32nd, and 64th from 0 to 3 inches. It also has height marking holes at every 32nd on the end. This size is obviously the perfect size to keep in your pocket, which is another reason why so many of our customers give these as promotional items or personal gifts.