All squares are precision ground and blades are hardened. Beams and blades are ground for parallelism. (BS 939 – Grade B) Accuracies less than 0.001″ deviation per inch over the entire length of the blade. Extremely useful for setting up workshop equipment. Technical Data:-
| 150575 | 2 | 50 | 0.050 |
| 260576 | 3 | 75 | 0.100 |
| 150577 | 4 | 100 | 0.150 |
| 260578 | 6 | 150 | 0.250 |
| 150579 | 8 | 200 | 0.550 |
| 260580 | 10 | 250 | 0.900 |
| 150581 | 12 | 300 | 1.150 |
