Trucks and heavy equipment Agricultural equipment Chinese-made electrical heads with advanced internal American specifications. 18-month warranty against manufacturing defects and heat. Japanese coil, 1750 RPM. 60 Hz, in addition to a developed Korean LS circuit breaker panel, 60 Hz. Withstands temperatures up to 60 degrees. Bearings on both upper and lower sides, immersed in thermal oil. Holds American UL certification, insulation class C, and 95% efficiency.