Champion Spark Plug RN9YC4 #301 Box Pack Detailed Description Champion Copper Plus- Boxed - RN9YC4; Dependable performance. This Champion spark plug features a copper core electrode that provides increased conductivity and heat control for good overall wear. Sale is for one spark plug. UPC: 37551000098 (Box Pack) Hex Size (In): 13/16 Inch Thread Size: 14mm Seat: Gasket Heat Range: 9 Thread Reach (In): 0.75 Inch Center Electrode Diameter (In): 0.1 Inch Center Electrode Material: Nickel Copper Alloy Center Electrode Tip Material: Nickel Copper Alloy Electrical Terminal Type: Removable Nut Preset Gap (In): 0.0394 To 0.0433 Inch Preset Gap (mm): 1mm To 1.1mm Number Of Ground Electrodes: 1 Ground Electrode Core Material: Nickel Copper Alloy Ground Electrode Material: Nickel Copper Alloy Ground Electrode Tip Design: Nickel Copper Alloy Installed Height (In): 2.24 Inch Insulator Height (In): 0.06 Inch Insulator Material: Zirconia Enhanced Insulator Projection (In): 0.06 Inch Resistor Plug: Yes Ribbed Core Nose: No Taper Diameter (In): 0.25 Inch USA domestic shipments are shipped USPS First Class Mail with Tracking International shipments are shipped USPS First Class International Mail with Tracking