Monster Pipe DogsDesigned 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 are a monster version of the pipe dogs. Designed specifically for welding larger pipe These incorporate the following features 1. 91" width Designed specifically with a monster contact patch to hold large pipe. designed to fit inside 2 inch Schedule 80 pipe Serrated on every single contact