The Kimber Safety Block Spring, model 1000812A, is a factory original part designed for Kimber 1911 pistols. Made from high-quality steel, this spring ensures reliable performance and durability. It is suitable for various calibers including .45 ACP, .38 Super, 9mm, 10mm, and .40 S&W. Ideal for replacing worn parts or keeping as a spare, this safety block spring is essential for maintaining the functionality and safety of your Kimber firearm.