H-STRUT Concrete Inserts are designed for the attachment or suspension of framing, piping or equipment to concrete structures where a continuous insert slot is required. Designed to be used with N1200 spot insert nuts, a 7/8"x 1-5/8"knock-out is removed after concrete pour. The spot insert nut is the slot, and then the rod screwed into the nut. The nut is secured in place by turning the rod. Lateral adjustment is made by losening the nut and relocating.