This 12 Inch Set Gives You Both Straight And Rounded Calipers With Which To Measure. Includes Inside, Outside, And Divider. Locking Screw Mechanism Assures Accuracy. Adjustable Screw Is About 3" Long And The Knob Is About 1/2" To Make Overall Screw Length Of 2 1/2". Outside Caliper Opens To About 11 1/2" Max.

* All Three Pieces Are Included In This Set-the Inside, The Outside, And The Divider Caliper

* Each Of These Spring Calipers Is 12 Inches Long And Equipped With A Screw Spring

* These Spring Calipers Are Used To Measure And Transfer Measurment One Place To Another

* This Set Is Great For Woodworkers For Measuring Joints-also For Drilled Hole Dimensions

* All Three Pieces In This Set Have All-metal Construction, And They Come In A Vinyl Bag