This set of (2) Master Mechanic cutting wheels are designed for cutting metal and steel with ease. The wheels measure 4 inches in diameter and are 1/4 inch thick, making them the perfect tool for any DIY or professional project. The chuck size is 1 1/2 inches and the power source is corded electric, ensuring a consistent and reliable power supply. This set does not include batteries. The voltage required for this tool is not listed.