This listing is for twenty five pieces. The PN weld nut features a strong single button projection which gives a deeper, more penetrating weld than is ordinarily obtained from other types of projections. Thus, the PN is ideal for use with heavier gage material. Thread Size #8-32 Width (in) 7/16" Thickness (in) 3/32" Length (in) 5/8" Hole In Sheet (in) 0.219" Material C1010 High-Welding Quality, Low Carbon Steel Plain Finish Threads Unified Standard Class 2B ASME B 1.1-2003