The multi-pupose fitting for creating your own jigs! Simply drill the appropriate sized through hole (30mm hole for the 20mm MagJig, 40mm hole for the 30mm MagJig), insert the MagJig and screw down the mounting plate - and it's done! Use in multiple jigs and select and deselect the magnetic hold with ease. Unlike C clamps and other conventional holding and clamping tools, Magswitch gives you the flexibility to position your jig or clamping device exactly where you need it. Just determine an ideal location in your jig fixture that ensures complete contact between the MagJig and your machine's steel table surface and let the MagJig do the rest.