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 1/4-20 Width (in) 1/2" Thickness (in) 1/8" Length (in) 13/16" Hole In Sheet (in) 0.312" Material C1010 High-Welding Quality, Low Carbon Steel Plain Finish Threads Unified Standard Class 2B ASME B 1.1-2003