Oscillating Belt/Spindle Sander Model 50-310 is a specialized sander for the fast and accurate sanding of curved board edges. The 4” x 24” belt and spindle sanding sleeves oscillate up-and-down 5/8”, 58 time per minute while the spindle spins, providing more efficient abrasive cutting action. Powerful 1/2 HP motor, ample cast metal table and 5 spindle diameters (1/2” to 2”) with 6 table inserts make this a valuable machine for every shop. Includes 4-1/2” long 80 grit abrasives.