Its principal feature is the start datum or 0 is the end of the ruler, typical use would be measuring the depth of a feature, such as a blind bored hole.
use oil
A steel rule is most commonly refered to as an engineers rule.
Because it's markings are clearer than on a wood rule.
A flexible steel rule is similar to a rigid steel rule but it is easier to bend and it does not retain shape when bent, but springs back to it's original straight shape. You use it to measure length or distance. You can also use it to whack (hit) things, but don't do your little brother or he'll tell Mom.
"National Steel Rule's website has information on Steel Rule. Fine-Tools and Helmold may also have information on Steel Rule. Wikipedia has info on general rulers, too."
Tool steel.
The term rule in this context is synonymous with ruler, a marked strip that can be used to measure length. A flexible steel rule is make of thin, flexible steel.
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A ruler made of stainless steel.
Steel rule die cutting is a process used to cut a large variety of sheet materials, like paper, cardboard, rubber or plastic. The packaging industry makes heavy use of this method, though many other industries have a use for it as well.
A flexible steel rule, spring assisted, that coils to its own case after use
stainless