This is a Ridgid No. 136 Hinged Pipe Cutter
You can see 136 RIDGID and No. 136C stamped on it.
What it's used for:
It’s for cutting large diameter steel, cast iron, and ductile iron pipes cleanly and square.
Key specs from the tool:
1. Model: Ridgid No. 136
2. Type: Hinged pipe cutter - it opens up so you don’t have to slide it over the end of the pipe
3. Capacity: Usually cuts 6" to 8" pipes. The 136 is Ridgid’s big one
4. Material: Aluminum body, so it’s lighter than the cast iron ones but still heavy duty