Acruz- do you mind me asking what this knob is for? If it’s for the impact, send me a pm. I converted all 60 fasteners on my impact to stainless, and to top it off I wanted a stainless knob for the rear shoulder adjustment, and a knob for the barrel removal, like it used to be when the impacts first came out. I was able to source two stainless knobs that are both approx. 7/8” in diameter with knurling, so they matched up. For the shoulder adjustment it’s 5mm thread pitch by 25mm thread length, and for the barrel lock 6mm pitch and 8mm thread length