Double Square Set, 4" and 6" 4R
- 4" 4R blade with 2.5" base
- 6" 4R blade with 4" base
- 4R Graduation – 8ths, 16ths, 32nds, 64ths
- Scale accuracy: 0.001"
- Squareness: 0.0015"
Pair of heavy duty hardened, precision ground double squares, 4" and 6". Blades are graduated in 8ths, 16th, 321nds, and 64ths. Blades are satin chrome finished to reduce glare and rust, and are easy to read.
Made to US standards for accuracy and squareness with scale accuracy of 0.001" and squareness of 0.0015"
The 6" square has a bubble level and the squares may be locked at any position along the blade.
Squares come in a storage case with foam insert.
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.
|1/8th inch measurements|
|1/16th inch measurements|
|1/32nd inch measurements|
|1/64th inch measurements|