20-30pcs same diameter diamond saw blades per machine is suitable for 4 column machine, such as 1200mm Multi-Blades, this is popular out of China specially in Iran market. 10-20pcs different diameter(2) diamond saw blades per machine is suitable for single arm machine, like 5 big 5 small blades together(such as 5pcs 1600mm blades and 5pcs 1000mm blades, all segments specification are same), actually this is popular in China during 2002-2005 Diameter from 800mm-1600mm. The above specification is only for Reference, other or special specification can be ordered by customers Wet use only with sufficient water, Fast & Easy cutting, long life, perfect performance