Includes (8) 4164 Spark Plugs. Thread Size: 12mm Thread Pitch: 1.25mm Seat Type: Gasket Reach: 19mm (3/4 ). Hex Size: 11/16 (17mm) Terminal Type: Removable Nut. Material: Nickel Type: Necked Down Projection: Projected. Copper core improves resistance to fouling. . Compatible with the Following: Bosch: 7409 Bosch 7416 Bosch X5DC Bosch XR4CS Bosch XR5DC Bosch Y6DC Bosch YR6LDE Champion: 810 8812 8815 8819 A8Y A8YC OE083 RA6HC RA8HC RA8Y RA8YC NGK: 1068 2130 3108 3481 3932 5129 5531 5629 6046 7512 7563 7682 7803 7912 D6EA D7EA DCPR6E DCPR7E DCPR7EIX DCPR7EVX DP6EA-9 DP7EA-9 DP7EV-9 DPR6EA-9 DPR6EB-9 DPR7EA-9 DPR7EIX-9 DPR7EV-9 DPR7EVX-9 DPR9EA-9 Torch: C7TC D7C D7CA D7RC D7RP D7RTC D7RTP D7TC DK7RTC DK7RTP