? Aluminum oxide abrasive produce a strong, keen, long-lasting edge and are the choice for the best blend of cut rate and finish ? Round files are ideal for deburring, chamfering, radiusing, lapping, honing, cleaning radius tools to a burr free edge, and dimensioning compound curves on templates ? Coarse grit is the choice for restoring badly worn cutting edges and for all sharpening not requiring a keen edge ? The use of oil with sharpening stones enhance the sharpening action and minimize the clogging of the stone's surface ? Norton Sharpening Stones have been the world leader for over 150 years ? Abrasive files hold their shape while imparting the finest, most uniform finish on precision machine parts and tool and die making. They are ideal for any deburring, chamfering or radiusing job or for filing delicate parts. Select the shape that matches the contour of the surface being stoned.