The slide notch and sear spring Surface have been meticulously polished post-hardening to ensure optimal performance and maintain the precise overall length, eliminating the need for additional fitting. Nowlin introduces an exclusive, long-lasting, fully-machined and hardened disconnect, now enhanced with pre-polished engagement surfaces. This innovation delivers the coveted "breaking-glass" trigger pull, highly desired by seasoned shooters. Designed for seamless integration, it effortlessly fits into any 1911 auto, enhancing functionality or serving as a key component in your next trigger upgrade. Experience superior performance and precision with this expertly crafted enhancement. 4140 steel, blue, matte finish 1.3 inches in length