This RYOBI A90AS16 Rotary16 pcs Carving & Engraving Kit is perfect for wood, metal, plastic, and glass. The kit includes 16 pieces with a variable speed feature. It is manufactured in China and complies with California Prop 65 Warning. The kit does not come with batteries and is designed for carving and engraving. It is a great addition to any workshop equipment and perfect for home use. Get creative and make beautiful carvings with this kit.