The PanaVise 335 Magnet Base – attaches to the 201, 220, 300, 301, 305, 391, and 396. Attach a PanaVise to any flat, ferrous metal surface! Perfect for machinery, truck beds, toolboxes anywhere magnets are NOT a problem. Magnet is slightly recessed into Base Mount to avoid scratching metal surfaces. Magnetic power holds up to 5 lbs. (2.3kg) at 90 Degrees. Overall diameter: 4.32-Inch (2.28mm). Height: 0.5 (12.7mm), Weight: 1.0 lbs. (0.4kg).