Combination Square, 12" 4R, StarrettMade in United States

Combination Square, 12" 4R, Starrett
  • Starrett 12" combination square with square head
  • Starrett catalog number 11H-12-4R
  • Graduation No. 4R- 8ths, 16ths, Quick Reading 32nds, 64ths
  • Machine divided blade
Part Number: 1839
Weight: 1.20 lb

Price: $105.00

In stock
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The square has a reversible lock bolt, scriber, spirit level, and hardened steel, photoengraved blade with regular finish. Cast iron head with black wrinkle finish.

The blade is 1" wide and 3/32" thick.

Chris Chris' Tips
The combination square was invented by Leroy Starrett (yes, that Starrett) in 1877. It's one of those basic tools that should be in every machinist's (and woodworker's) tool box.

Here is some information on using a combination square from Starrett.

We carry several Starrett 12" combination square sets. What's the difference? There are several features that affect the price. One is the protractor head. Squares with a reversible protractor head cost more. Another is the scale. Squares with satin chrome scales cost a little more.

Warning Icon WARNING: This product can expose you to lead, which is known to the State of California to cause cancer and/or reproductive harm. For more information go to