3.7HP SPL Air Compressor Electric Motor 230V 3450 RPM with 5/8″ Keyed Shaft 60Hz. – High-speed 3450 RPM for rapid and efficient air compression. – 5/8″ Keyed Shaft for secure and easy mounting. 【Durable & Heavy Duty Build】Constructed with premium cast iron and aluminum alloy housing for excellent heat dissipation and corrosion resistance.