METAPOL SA Single Wheel 10" or 12" Automatic Metallurgical Grinder Polisher. offers 3 Place Individual Force Sample Holder for 1", 1.25" or 1.5" Mounts. You can Grind and Polish 1, 2 or 3 Mounts at a time without using dummy mounts. The SA has variable speed wheel (0-600 rpm), with rotation in both directions. Pressure is applied with Individual spring-loaded pistons eliminating the need for air pressure while the Auto-Head rotates at a fixed speed. The Metapol SA comes with a Magnetic Platen for quick changing grinding discs and polishing cloths. The SA offer the benefits of easy-to-use control of Time, Water and Speed and a quick-locking swing mounted design. 110V