Designed and manufactured by constant feedback.  These are teeth that can fit on the commonly used 8 inch 3 jaw chunks that welders use such as the K11-200A. 

These incorporate the following features

-designed to fit inside 2 inch Schedule 80 pipe

-Serrated on every single contact surface

-Flat bottom holes which are the same depth so one bolt size (no need to carry extra hardware)

-Large contact patches that are radiused for maximum contact area. 

-Made 100% in the United States of America

Sold in sets of 3