Global Truss Book Corner 0-180 Degree Variable Angle Corner BlockThe Global Truss BOOK CORNER SQUARE is part of the Global Truss F34 Square Truss offerings. This variable angle corner junction provides a 0 to 180 variable angle book corner for square and triangular truss segments. You can use this item with a spacer clamp and a swivel clamp. This 16 pound unit is fabricated by certified TUV welders and comes equipped with connecting hardware.