Material:Carbon steel <br>Main purpose: Stone / Jade / ceramic / glass / Carbide / cutting / grinding / engraving Handle </br>Shank Diameter: 3mm <br><br>Model:</br>7pc Solid Wheelsl</br> +3pc Holed Wheels Blade <br></br>Diameter: <br>16mm (1Piece)</br> 19mm (2 Pieces) <br>20mm (1 Piece)</br> 22mm (2 Pieces) <br>25mm (2 Pieces) </br>30mm (1 Piece) <br>40mm (1 Piece)</br>