The gen 2 series of brakes features a nut that is a separate piece that allows you to install the brake at home.Installations take about 30 seconds and have no hideous crush washers or peel washers to deal with.It is precision machined out of high-grade stainless steel.This brake is meant for larger barrels that are generally required by the 338 lapua etc.Finish: StainlessModel: Gen 2 Fat BastardMaterial: Stainless SteelThread Pattern: 5/8"-24 tpi