A T-nut, T nut, or tee nut (also known as a blind nut, which can however also refer to a rivet nut) is a type of nut used to fasten a wood, particle or composite materials workpiece, leaving a flush surface. It has a long, thin body and a flange at one end, resembling a T in profile. The flanges of T-nuts often have hooks or serrations on the prongs that sink into a wooden work piece, providing better retention. The prongs of a tee nut act as hooks to hold the nut to the surface leaving a flush face on the nut side, as long as the bolt is the right length. Since the small prongs are what digs into the material, the material is less likely to split or crack. T nuts in this selection come in 3 prong or 4 prong varieties