6"/150mm ADJUSTABLE DEPTH GAGE Head with No Markings and Rule Head Made of Hardened Steel Base Surface Measures 2-1/2" x 1/8" Thick Center of the Head Features Recess Cut-Out for Easy Reading and More Accurate Measurements of Depth Gage Includes 6" Rule Made of Hardened and Tempered Steel Rule Measures 7/32" Wide and .041" Thick with Deeply Etched, Quick-Reading Markings Inch/Metric Graduations 32nds One Side, .5mm Second Side Made in USA