A7TC : Size M10 X 1 1.Reach : 12.7mm 2. Hex :16mm 3. Gap :0.6mm 4.Thread Diameter : 10mm 5.Seat : Gasket 6. Terminal : Removable Can Used To Replacement NGKD8EA . . CHAMPIONA8YC,DENSO X16EP,BOSCH X4DC 1)..Multi-ribs designed on the insulator can easily eliminate flashover 2)..Insulator made of 95% pure alumina, strong resistance of heat shock, great mechanic al and electrical features, super insulation 3)..Nickel plated housing prevents oxidation and corrosion, heat crimping process ensures absolute gas -tight fit 4)..Inner sealing with conductive glass ensures a fine conductivity and sealing 5)..Multi-layer gasket are elasticly strong, and reliable in sealing 6)..Copper core electrode prevents oxidation and corrosion, good electric and heat conductivity, long service life