This is a Runner brand gasoline-powered concrete vibrator, similar in design to those utilizing Robin EY20 engines.
It is designed for compacting poured concrete to eliminate air bubbles and increase structural strength.
These units typically feature a 5.0HP or 5.5HP petrol engine and include a sturdy yellow metal frame for portability and protection.
The machine operates as an internal poker vibrator, often compatible with various shaft sizes like 38mm or 50mm