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 1 1/4" steel two hole flange pins as shown. They are made of carbon steel They will work on hole size 3/8" to 1 3/16" up to 2 " thick Has steel quick acting knob, you loosen 1/2 turn, tilt and knob will slide off end. They have 3/8-16 stainless threaded rod and 45 degree taper Made in USA