Specifications: Specifications For C Short 12.7MM *High Performance 3-Electrode Spark Plug A7TC for 50CC-150CC ATV Motorcycle Corresponding Model: A7TC ATRTC CR6HSA CR7HSA CR7HGP Thread diameter: 10mm (Approx.) Thread length: 12.7mm (Approx.) Package weight: 35g Specifications For D8TC Long 19MM: Gross weight: 40g Color: red Thread diameter: 12mm/0.47" Thread length: 19mm/0.75" Corresponding model: D8EA, D8RC, DR8EA, D7EA, D8TCDR8EGP, DPR8EA-9, DPR8ElX-9, DR7EA-9, D7REC2, DR8VX, DR7EA, D8RTC, A8YC, P-RA7HC, T2197