The Magswitch Universal Base System allows you to attach a variety of current and future Magswitch attachments. Simply insert two 20mm or 30mm MagJigs, place anywhere on any cast-iron tabletop, and you have a unique safety device that helps your woodworking be the very best it can be. Accepts all MagFence Universal accessories. Fast, precise setup on all steel or cast-iron tools. Included adaptors allow use of either 20mm or 30mm MagJigs. Expandable for use with future Magswitch products. Enhanced shop safety. Dimensions: 217(L) x 110(W) x 20mm thick. Weight: 395g.