This listing is for twenty pieces. The SN weld nut (economy t nut) is a spot weld, precision-pilot nut which features an optimum welding tab. This tab will take several sizes of electrodes and permits use of the same equipment, settings and electrodes used to produce your product or product components. Where the nut is to function as a stiffener or brace in addition to being a fastener, the SN weld nut is ideal. Thread Size 5/16-24 Width (in) 5/8" Thickness (in) 9/64" Length (in) 63/64" Hole In Sheet (in) 0.375