This 9" Set Gives You Both Straight And Rounded Calipers To Measure With Inside, Outside, And Divider. Locking Screw Mechanism Assures Accuracy. Adjustable Screw Is About 2 1/2" Long And The Knob Is About 1/2" To Make Overall Screw Length Of 2".

These calipers will handle a great deal of your measuring needs, They have many uses

Calipers are useful in many fields such as mechanical engineering and metal working

Also used in forestry, woodworking, science and medical application

Made of steel, with screw tension knobs to hold them in place

Once you have the position locked in place, you can measure the distance with a ruler