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 die-cast aluminum table can be positioned horizontally or vertically for your convenience, and the lockout power switch helps provide safety.