No more inconvenience to control your grinder off and on and adjust the speed with our flex shaft foot pedal. It is made of heavy-duty plastic in durable struction to be a long lasting footpedal. The ergonomics allow precise and reliable speed control with your foot. You can adjust the constant speed and rotating speed by adjusting the bottom screw of the foot pedal. Suitable for our shop 380w and 780w 1/4"HP flex shaft grinder rotary tool. A must have piratical replacement! Variable speed foot pedal control switch: Simply plug the foot pedal into your wall outlet, and then plug your device into the back of the plug, and the foot switch pedal will now be in line with the flex shaft motor. Features: Brand New US standard plug (110V) Package Included 1 x Foot Pedal Why we choose Plastic Material Steel material may vary the speed more obvious, but steel material will conduct heat and easily hurt user. After Exploring many times, we decide use plastic. Note: The speed control range depends on user experience and "feeling". Thank you for your understanding.