ACDelco Wheel Cylinder - 18E316 Part #: 18E316 Line: ACD ACDelco Wheel Cylinder 2 Year LIMITED WARRANTY Material: Cast Iron Hardware Included: No Bleeder Screw Cap Included: Yes Bleeder Screw Included: Yes Inlet Thread Size (in): 3/8 Inch Inlet Thread Size (mm): M10 Wheel Cylinder Bore (in): 7/8 Inch Wheel Cylinder Bore (mm): 24mm Show More Show Less