Works Connection Rear Master Cylinder Guard Yamaha Yz250F / Yz450F / FX The Works Connection Rear Master Cylinder Guard was designed to offer maximum protection from rocks, roost and any other track or trail debris. Constructed from lightweight, aircraft grade aluminum and CNC machined to exact specifications for a perfect fit and factory look. Features: Covers and protects the rear brake master cylinder Provides increased surface area for improved grip and control CNCd and formed from aircraft grade 5052 aluminum Simple bolt-on installation Made in the USA Note: Images are for reference only.