Features 3/8-16 stainless threaded rod which helps prevent weld spatter from sticking.Also comes quick knobs, 1/4 turn on, 1/4 turn off This is for one set of 2" Steel- two hole flange pins with quick knobs as shown. They are made of carbon steel They will work on hole size 3/8" to 1-7/8" up to 1 1/2" thick. They have 3/8-16 stainless threaded rod and 45 degree taper Made in USA