Spiral-stitched construction with 5 individual layers of sisal fibre. Hard wheel for burnishing, cutting and flattening. For best results use one compound per wheel. Can be stacked onto tapered spindles to achieve required thickness. 16mm / 5/8″ bore for use with all 150mm bench grinders and polishers. Spiral-stitched construction with 5 individual layers of sisal fibre. Hard wheel for burnishing, cutting and flattening. For best results use one compound per wheel. Can be stacked onto tapered spindles to achieve required thickness. 16mm / 5/8″ bore for use with all 150mm bench grinders and polishers.