Features & Benefits:

• Contains 2 ratcheting wrenches 5/16"x3/8" and 8mmX10mm
• Ratchet allows for continuous loosening and tightening
• One way check valve in hose to prevent air when pumping brakes
• One person operation
• Made in USA

Fastener size on one side bleed port on the other.  Check valve in hose prevents air from returning to system when pumping the brakes.  The ratcheting wrenches allows continuous loosening and tightening of bleeder screw without removing the wrench.