The MM 2500 was designed for the serious stone craftsman. This machine features additional weight and power for the fastest, most cost effective performance available today. The MM 2500 has been beefed up, weighing 170 lbs. with the ability to add weight in 9 lbs. increments. The head speed of this machine has been increased to 320 rpm for increased performance when flattening, honing and polishing marble, granite, terrazzo and other natural stone surfaces.