Gummy stones are often overlooked when starting side-edge and base-edge work. Using a Gummy Stone is an efficient way to detune (slightly dull) the tip and tail area and to remove micro-burrs from filing. The Grey Gummy Stone is also great for removing rust. Be careful when using gummy stones as they can dull your edges if used too extensively. Use light pressure flush to the edge angle to minimize unwanted detuning. Soft Grey Gummy, Best used before doing edge work to remove rust and burs, Also used to detune the tips and tails if desired, GTIN: 7045950403894, Model Number: T0992, Product ID: 38983, Model Year: 2022, Tool Type: Stone