The stone leveling kit is a 12” diameter, ¼” thick piece of glass, w/ rubber molding installed around the circumference. It comes with a ½ pound bag of 60 grit (coarse) silicon carbide. Use the stone leveling kit to resurface your sharpening stones after heavy use. By sprinkling about a ½ teaspoon of the silicon carbide on the stone leveling kit, and adding a little water, you can grind the high spots of the stone down until it is level again. Use the opposite side as a perfect surface for mounting your Professional or Apex model. The rubber guard will help contain metal shavings and deaden the sound created from leveling stones. Due to the rising cost of postage, we are no longer shipping the SLK internationally.