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.