Tuffite stones always have a black and grey pattern

which allow for the measurement of blades with varying widths

It's available in different stone bundles

Bonded diamonds give the sharpening stone a much longer lifespan

leading edge core upgrade for work sharp ppa back-in-stock Tuffite stones always have aLeading Edge Core Upgrade enhances the capabilities of WorkSharp Professional Presicion Adjust knife sharpeners with features of the Leading Edge sharpening platform. Core Upgrade offers a magnetic working table with a three point knife guide and can be extended with Leading Edge attachments. Core Upgrade utilizes a magnetic block 1. 5 x 0. 5 x 0. 25 inch with powerful N52 grade neodymium magnets. Knife Guide allows you to position a knife precisely