Features: Made of good quality materials, lightweight and durable for long time use. This is a centrifugal switch for single-phase motor, applicable to many machines, such as stitching machinery. Help start electric motor safely and quickly. Easy to install and use. 19mm shaft diameter and 1500RPM. Specification: Model: L19-154S Material: Metal Revolutions Per Minute: 1500RPM Motor Shaft Diameter: Approx. 19mm Weight: Approx. 102g Package List: 1 x Centrifugal Switch