Jet JSM-620 3/4-Inch by 20-1/2-Inch Pnuematic Belt Sander Rear exhaust directs air away from work. Equipped with exhaust silencer for noise reduction Built-in regulator for postitive speed control. JSM-630 has dead handle for better control 360 head rotation provides versatility for every job Belt-tracking adjustment is conventiently located Comes with 120 grit sanding belt