"This Coring Bit CANNOT be sharpened. To maximize this Coring Bits lifespan and cutting quality, we recommend using it on a Variable Speed Grinder. Due to the wide variability in material densities on the market, a Variable Speed grinder allows the user to adjust speeds on a project to project basis, ensuring the best possible results. Although this coring bit is designed for both Dry and Wet Use, for sizes smaller than 12mm, it is recommended to use a water feed, to enhance the Coring Bits lifespan.

"This Coring Bit CANNOT be sharpened. To maximize this Coring Bits lifespan and cutting quality, we recommend using it on a Variable Speed Grinder. Due to the wide variability in material densities on the market, a Variable Speed grinder allows the user to adjust speeds on a project to project basis, ensuring the best possible results. Although this coring bit is designed for both Dry and Wet Use, for sizes smaller than 12mm, it is recommended to use a water feed, to enhance the Coring Bits lifespan.