? Aluminum oxide abrasive produce a strong, keen, long-lasting edge and are the choice for the best blend of cut rate and finish ? Round pointed files are ideally suited for engravers and die sinkers for stoning difficult recesses on instruments and die tools ? Fine if preferred for producing sharper than average edges on woodworking tools, gouges, reamers, taps, auger bits and twist drills ? 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.