Cutter head with three high-speed steel knives locks firmly in place to prevent movement while in use. Heavy-duty cast iron and steel construction for added strength and durability. Two-speed gear box with automatic chain tensioner lets you adjust the feed rate to meet your needs. Large, cast iron, precision ground table for precise workpiece support. Powerful 3 HP TEFC induction motor with three V-belt transmission for smooth and consistent power. JWP-16OS: 16" 3HP OS Planer.