ACDelco Wheel Cylinder - 18E1216 Part #: 18E1216 Line: ACD ACDelco Wheel Cylinder 1 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): 3/4 Inch Wheel Cylinder Bore (mm): 19mm Show More Show Less