MEASUREMENT AND CONTROL INSTRUMENT ACCESSORY; COMPONENTS: EXTERNAL THREA D HEIGHT GAGES; MODEL: TH-3002B; THREAD HEIGHT GAGES TH-3002B; EXTERNAL THREAD HEIGHT GAGES; 0-25; INCLUDED T072; CONNECTION: 3/4" TPF BUTTRESS; TRAVEL: 0.094"; MIN BORE: 2.930" MODEL 1: TH-3002B