The Evolution Gun Works precision 1911 barrel bushings are machined out of solid steel bar stock. These bushings are oversized and will require fitting for almost all applications. The inside diameter of this bushing is .568" with a straight bore (not tapered). The outside diameter is .701" with a thick flange. The flange is .125" thick, more than the mil-spec bushing, offering better support for your barrel. Notes: This part requires fitting to the barrel and slide. Gunsmith fitting is recommended.