1/2″ / 12.7mm thick wheel constructed with dense felt . For polishing, finishing and honing. For best results use one compound per wheel. Can be stacked onto tapered spindles to achieve required thickness. 15mm / 19/32″ bore for use with all 150mm bench grinders and polishers. 1/2″ / 12.7mm thick wheel constructed with dense felt . For polishing, finishing and honing. For best results use one compound per wheel. Can be stacked onto tapered spindles to achieve required thickness. 15mm / 19/32″ bore for use with all 150mm bench grinders and polishers.