This RYOBI 4 in. x 36 in. Belt/Disc Sander is a combination belt and disc sander that delivers 120-volts of power to help provide efficient operation. The cast-iron base helps keep the sander stable during use so you can apply the desired amount of pressure and achieve consistent results. The sanding bed can be positioned horizontally or vertically for your convenience, and the lockout power switch helps provide safety.