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 Davis 1" Aluminum two hole pins with quick knobs. they have 3/8"-16 stainless threads and 45 degree tapers. Quick knob works by sliding knob on threaded rods and a 1/4 turn to lock in place