The Milwaukee 21' Concrete Vibrator Shaft (48-37-7021) is designed to transfer power from the motor to the concrete vibrator head. These shafts offer superior durability and productivity. The all-metal coupling prevents melting and deformation throughout the shaft’s life. All Milwaukee shafts feature a quick connect system that allows you to quickly and easily attach and detach the shaft. The Milwaukee Concrete Vibrator Shaft is for use with MILWAUKEE® MX FUEL™ Concrete Vibrators. These concrete vibrator shafts are available in 7 ft, 10 ft, 14 ft, and 21 ft sizes.