This is a box of 4 Champion Copper Plus spark plugs. These are new old stock and still in the original packaging.

Plug Type: RV12C6

Seat Type: Tapered

Hex Size (Inch): 0.625

Hex Size (MM): 15.88

Thread Size (Inch): 0.551

Thread Size (MM): 14

Thread Reach (Inch): 0.441

Taper Diameter (Inch): 0.27

Installed Height: 2.02

Gap (Inch): 0.057-0.063

Gap (MM): 1.45-1.6

Center Electrode Diameter (Inch): 0.1

Center Electrode Material: Nickel Copper Alloy

Ground Electrode Material: Nickel Copper Alloy

Classification: Champion Copper Plus

Resistor Plug: Y