Magswitch MAGJIG 150 MagJig 150, Yellow/Silver This 30mm Mag Jag is simple and fast, the ultimate strong clam that is versatile  use anywhere on the table Features easy on/off  secure all your jigs & fixtures and fast, strong, and precise positioning Drill holes and simply insert the Mag Jig On/Off Magnetic clamp with Incredible 150lb/67kg of magnetic hold force. Make custom jigs and fixtures by drilling a hole using a Forstner bit into  thick material. Precise positioning anywhere on a steel table or fence. No mitre slot limitation. Use with the Magswitch Universal Base as part of the Magswitch Workholding System. Use 40mm Forstner Bit to drill custom jigs and fixtures (sold separately).