This a set of five NOS Left Thread studs. These are for the M38 and M38A1. They have the short splines because they do not have to go through the brake drum like the WWII and civilian models. These are "L" marked originals. Stud, Bolt, Ribbed Shoulder, 1/2-20 NF-3 X 1.42 Left thread.  QTM Parts