A huge 800mm sq additional XL base plate in 6mm steel with a grey painted finish. Comes with a multitude of drilled hole so as you can fit your truss base plate to it. Designed for use with truss builds that will need that extra support or where fixing into a floor is undesirable but demanded for stability. Often used for goal post and portal trussing designs for backdrops alsofreestanding single columns of truss for lighting arrays.