- Three measuring heads are attached to the stainless steel rule (blade), allowing versatile measurements on various types of workpieces.
- The measuring heads are hardened.
- Square head is used to set the rule at 90 degrees or 45 degrees to the edge of a workpiece.
- Center head is used to locate centers of round workpieces.
- Protractor head is used to set the rule at a desired angle to an edge of a workpiece