The OEM rear brake master cylinder in black is designed for Harley-Davidson motorcycles from 2000 to 2017 Softail and 1999 to 2007 Touring models. This genuine part is manufactured in the United States with a bore diameter of 0.75 inches, ensuring a perfect fit and reliable braking performance. Upgrade your motorcycle's braking system with this high-quality rear brake master cylinder from Harley-Davidson.