Stem Polishing Discs 80 pcs. 8 mm in diameter: for gross reduction (â„– 1.611) 5 pcs. for contouring (â„– 1.612) 5 pcs. for finishing (â„– 1.613) 5 pcs. for polishing (â„– 1.614) 5 pcs. 12 mm in diameter: for gross reduction (â„– 1.621) 5 pcs. for contouring (â„– 1.622) 5 pcs. for finishing (â„– 1.623) 5 pcs. for polishing (â„– 1.624) 5 pcs. 14 mm in diameter: for gross reduction (â„– 1.631) 5 pcs. for contouring (â„– 1.632) 5 pcs. for finishing (â„– 1.633) 5 pcs. for polishing (â„– 1.634) 5 pcs.