Sturdy clips can be used for temporary or permanent fixation of I-beam, board, hardware machinery, architectural decoration brackets, etc.It can also be used to hang some heavier objects under steel beams or ceilings The C-clamp is made of 4.5mm thick stainless steel, strong without welding; with stainless steel screw ring that can withstand 100 pounds.Disassembly and assembly at any time, simple and convenient The screw-compressor can be clamped in the range of 1"25mm. Both the back and the bottom plate have a screw hole with a diameter of M8. You can install the stainless steel screw ring provided in the package,remove the screw ring when not needed The I-beam fixture are equipped with threaded clamp and spring washers to ensure that the object will not move after being clamped.Can be used indoors and outdoors(Disc type threaded clamp)