This Stainless steel constructed locking ring allows the reloader to set up a reloading die and lock in place so it can be removed and replaced without having to recalibrate. Fits on 7/8"-14 threaded dies. External width of nut is 1-1/4".FeaturesLock nut - thickness is .225" from inside to outermost edge .270" for height and 1.250" total width OD7/8" - 14 ThreadIncludes set screw and Wilson's protective felt pad to go behind set