This t-nut is made out of 1215 steel with a black zinc finish and is compatible with our 10 Series extruded aluminum profiles or 1.0" based t slot aluminum extrusion. These nuts are used with a 1/4-20 bolt to mount joining plates, brackets, or other t track accessories. Works great for our 1010, 1020, 1050, 2020, and many 1.0" based extrusions. This t-nut measures .431 x .171 x .49 inch long and works great as mainstay piece of your home improvement arsenal. Our 8020 nuts work with other competitor's extruded aluminum t track profiles. The centered thread of the slide in T nuts lends itself to connections towards the middle of a profile or with a flat plate. This strong steel 1/4-20 nut loads from the profile ends. Add these to complete your unistrut hardware kit for future use! The standard slide-in T-nut is a fastening option that loads from the profile ends. It is a strong, durable connection that is available with options in size, thread, and finish.