Double Square, 6" 4R, PEC
- Double square with 6" blade
- Easy to read satin chrome finish blade is fully hardened and tempered
- 4R graduations, 8ths & 16ths, 32nds & 64ths
- Head has hammertone powder-coat finish
Double square made in the US by Products Engineering Corporation (PEC).
When using a precision rule for very close accuracy, the eye can read better by measuring between two lines than from the end of the rule to a line.
Here is how to use a steel rule.