StrongHold JP131SBC87-L20 J-Pro™ J hook with Screw-On Beam Clamps have a patented design, featuring complete horizontal and vertical 1" bend radius control. This feature prevents pinch points and degradation of cable performance. They are suitable for use in air handling spaces and are UL listed. For use with flanges up to 3/4" (19.1mm) thick and 1.31” (33.3mm) max bundle capacity. Made of Nylon 6.6, are black in color and come in packages of 50.