Panavise magnetic base mount attaches to any ferrous metal surface, such as a steel-topped workbench. The magnet is slightly recessed into the mount avoid scratching metal surfaces. Compatible with the 201 PV Jr. Vise and 300 and 305 bases. Magnetic power holds up to 5 lbs. at 90°. Magnetic Vise Base, 7/16 x 5 In