The MX-55 Burke Slot Insert is a high strength precast insert designed for use with “T” threaded straps. The unit has a sealed nut box to prevent concrete from leaking into the insert. Removal of the perforated slot-seal exposes the slot for quick connection of the strap. The insert is available in two styles: one furnished with a 3/4″ NC threaded nut and one that is supplied with a 3/4″ coil nut. Three insert heights are available: all are 6-1/2” long and are available in plain or hot dip galvanize finish.