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title: ERVD Fact Sheet
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# Download the ERVD™ Fact Sheet

The ERVD™ (Extended Range Variable Diameter) Step Block is the second addition to the ERV product line.

Jointly designed by PH Tool™ and Holloway NDT, it is intended for use as a versatile curved step block for thickness testing of pipe. The ERVD™ Step Block is available in both inch and metric measurements.

Please fill out the form to the right to download your free copy of this fact sheet. 

![ERVD capture](https://content.phtool.com/hs-fs/hubfs/ERVD%20capture.jpg?width=418&name=ERVD%20capture.jpg)

 

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### Download Your Fact Sheet

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