Wacker Neuson Internal Vibrator KitThe Head, Motor, and Shaft (HMS) system is extremely versatile. These high frequency flex shaft internal vibrators can be adapted to every type of application. Heads and shafts can be easily combined and rapidly exchanged to match the right equipment to the job. Unique hybrid heads offer optimum concrete consolidation and movement. HMS systems provide reliable performance and quality concrete 1. 3 HP motor 9 amps 15500 RPM SM2E shaft length 6. 5 ft.