![Steel Rule (Class-3) [what is/used/made of/parts/types/size/least count/specification/safety] - YouTube Steel Rule (Class-3) [what is/used/made of/parts/types/size/least count/specification/safety] - YouTube](https://i.ytimg.com/vi/nQzaMayhDvk/maxresdefault.jpg)
Steel Rule (Class-3) [what is/used/made of/parts/types/size/least count/specification/safety] - YouTube
![Starrett C331-300 | 11-3/4" Full-Flexible Steel Full-Flexible Rule 1/32", 1/64"; 3/64", 1/64" Graduation - All Industrial Tool Supply Starrett C331-300 | 11-3/4" Full-Flexible Steel Full-Flexible Rule 1/32", 1/64"; 3/64", 1/64" Graduation - All Industrial Tool Supply](https://cdn11.bigcommerce.com/s-mzpq4daxph/images/stencil/500x659/products/165910/177940/C334-300e56696cUSp1__32081.1596333144.jpg?c=2)
Starrett C331-300 | 11-3/4" Full-Flexible Steel Full-Flexible Rule 1/32", 1/64"; 3/64", 1/64" Graduation - All Industrial Tool Supply
Starrett (C304SRE-6) 6" Steel Rule, Satin Chrome Finish, Graduation: 4R | Width: 3/4" - 10-837-3 - Penn Tool Co., Inc
![a, b Drawing showing the free space according to Steel's rule of thirds | Download Scientific Diagram a, b Drawing showing the free space according to Steel's rule of thirds | Download Scientific Diagram](https://www.researchgate.net/publication/24221789/figure/fig2/AS:340932655370244@1458296087430/a-b-Drawing-showing-the-free-space-according-to-Steels-rule-of-thirds.png)