This product is a Concrete Vibrator from the Robbin brand, model SV-38, made in China. Usage: Used in construction sites to compact fresh concrete and expel air bubbles to ensure the density and strength of the structure. Specifications: Features a gasoline-powered engine, and often comes with a vibrator hose (Needle/Flexshaft) of a length suitable for pouring needs. Features: Helps produce a smooth, uniform, and void-free concrete surface. Size: The package dimensions shown are (15x380x515) mm.