This is for one set of 1" steel two hole flange pins as shown. They are made of carbon steel They will work on hole size 3/8" to 7/8" 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