Made from fine quality steel which has been hardened and tempered to provide the ideal balance between flexibility and durability.
| ER106 | 150mm/ 6" Engineers' Rigid Rule | 19 | 1.2mm |
| ER112 | 300mm/ 12" Engineers' Rigid Rule | 25 | 1.2mm |
| ER212 | 300mm/ 12" Engineers' Rigid Rule | 12.5 | 1.2mm |
| ER206 | 150mm/ 6" Engineers' Rigid Rule 300mm/ 12" Engineers' Rigid Rule | 12.5 | 1.2mm |
| ER306 | 150mm Engineers' Rigid Rule | 19 | 1.2mm |
| ER312 | 300mm Engineers' Rigid Rule | 25 | 1.2mm |
| ER424 | 600mm/ 24" Engineers' Rigid Rule | 25 | 1.2mm |