4" x 7" Magnetic Chuck Permanent Magnet Work holding For Grinding Machining chinacoal07 we provide service of enterprise's customs declaration, inspection. Grinding Machining Magnetic Chuck, Permanent Magnet ,4" x 7" Magnetic Chuck Description: This is a Precision 4" x 7" Magnetic Chuck for work holding during grinding, milling, and general machining operations on ferrous metals.  Here are the details: Permanent magnet chuck 4" x 7" work surface ON/OFF Switch Standard pole spacing Completely sealed from dirt and liquid Equipped with 1 adjustable back rail and 1 adjustable end rail OA Dimensions: 8-1/2" x 6-1/4" x 2-3/4" Weight: 18-1/2 lbs.