16 ER/IR 14W External/Internal Threading CRM carbide Insert pack of 10 Size:EXTERNAL the center's body should be

the center's body should be gripped in a drill chuck or collet

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Product Name: Dial IndicatorItem Number: 5121-1201Measuring Range:  0~3 mm Graduation:  ±0

Run out tolerance is maintained by grinding by the center to center and they have center hole both sides

check the Shank size 20 mm and 25 mm

16 ER/IR 14W External/Internal Threading CRM carbide Insert pack of 10 Size:EXTERNAL the center's body should beSELECT EXTERNAL OR INTERNAL CAREFULLY. CRM EXTERNAL HAS A YELLOW BOX, AND INTERNAL HAS A BLUE BOX High profile accuracy. Parameters are mentioned on the box's back side suitable for mostly steel grades, stainless steel grades Prevents chip curling, thus less tool breakage.