Spare original MAGURA bolt in EBT bleed port for disc brake calipers MAGURA MT (all models 2015 / 2017 / 2019 / 2-piston / 4-piston). Small bolt is made from steel and keeps the fluid inside the braking system. BE AWARE! Tightening torque of this bleed port bolt is max. 4Nm, or you can damage it!