Measures 1/8" To 1 1/8"; Easy To Use - Measures Both Inches And Millimeters. You Can Measure The Diameter Of A Drilled Hole, And You Can Measure Screen Wire With The Same Tool, Up To 1/2" Or .500 Inch Decimal Equivilent.* Also Includes A 3" Ruler * Made Of Stainless Steel * Accurate Measurements * Easy To Meaasure Inside Diameter Measures 1/8" To 1 1/8" * Etched And Painted Black, Easy-To-Read Markings