Slave Cylinder Rebuild Kit - Clutch. All Balls Racing Clutch Slave Cylinder Rebuild Kits contain all of the components to re-seal leaking master cylinders. Contain all of the components to re-seal leaking slave cylinder. Features upgraded components for long service life. Note: Kit contents will vary by fitment and are subject to change. Kit Includes: 1 boot(s). 4 screw(s). 1 O-ring(s). 2 washer(s). 1 piston.