? Spiral construction avoids shadow marks and provides smooth, chatter-free cutting action ? Achieves close tolerances when finishing curved, contoured, and hard-to-reach areas ? 40-60 grit is recommended for removing heavy burrs, removing flash and parting lines and removing rust, scale and pit marks ? Bands are easily removed and replaced ? Premium aluminum oxide for fast cutting and removing the toughest metal ? Spiral bands are the best product for blending, polishing and finishing contours in hard-to-reach areas, removing parting lines, imperfections, and burrs on all surfaces. They are recommended when smooth running is a primary concern.