Performance Machine Race Series Monobloc Brake Caliper For Harley Harness the power of racing technology for your Harley with Monobloc calipers. Crafted from a single billet of aluminum for unmatched rigidity, these calipers enhance direct feel and increase stopping power by a remarkable 20 compared to OEM units, thanks to their four large diameter pistons and differential bore design. This state-of-the-art upgrade promises a significant boost in performance, ensuring superior stopping power and control. Features: One piece Monobloc construction provides increased rigidity and improved performance 4 piston differential-bore design provides 20 more stopping power than OEM Compatible with ABS and non-ABS brake systems Works with OEM and aftermarket master cylinders Designed for 11.8 (300 mm) rotors Sold individually, left and right Made in the USA