Hanperal 7 Stlye Dremel Hole Master, Leather Burnisher kit, leather slicker Tool Material:Cocobolo . Groove depth: 6mm/8mm/10mm/12mm/14mm For edge burnishing, you may want to use saddle soap and water.Glycerin soap also works well. The speed used for this burnisher should be between 1000-1500 rpm. This burnisher is ideal for finishing holsters, knife sheaths, saddles, etc.