This oscillating spindle sander features a dual-action sanding spindle that moves at 1725 RPM and 30 OPM (oscillations per minute) with a 5/8 in. stroke for faster material removal. The spindle makes it easy to sand curved and contoured surfaces that would be difficult to accomplish with a hand or orbital sander.,This oscillating spindle sander features a dual-action sanding spindle that moves at 1725 RPM and