SeaISee 7 Stlye MINI Dremel Hole Master,Coco Bolo Leather Burnisher, leather slicker Tool Material:Cocobolo Groove depth: 6mm/8mm/10mm/12mm/14mm This set include 7pcs:Sharp,Flat,6mm/8mm/10mm/12mm/14mm Groove Simply wet the edge of the lLeather and then add either saddle soap or glycerin for a fine burnished edge. For edge burnishing, you may want to use saddle soap and water. Glycerin soap also works well.