The Magswitch Universal Base is the centerpiece of the Magswitch Workholding System. All tool attachments are designed to fit the Universal Mounting Base. Low profile design enables use on small surfaces including fences and small table tops. Requires two MagJigs to secure the Universal Base to a steel or cast iron surface. Accepts both MagJig 30mm (150 lbs of hold force) and MagJig 20mm (95 lbs of hold force). Simply add the desired tool attachment, place anywhere on any steel or cast-Iron tabletop, and you ready to go. Add more Universal Bases and MagJigs to use multiple tools at the same time.