Includes (12) B8HS-10 Spark Plugs. Thread Size: 14mm, Thread Pitch: 1.25mm, Seat Type: Gasket, Reach: 12.7mm (1/2"). Hex Size: 13/16" (21mm), Terminal Type: Removable Nut, Overall Height: ISO, Gap:.039" (1.0mm). Material: Nickel, Type: Standard, Size: 2.5mm, Projection: Non-Projected. NGK standard plugs are constructed for longer life and optimum performance. Compatible with the Following: Autolite: 4092, XS4092, Bosch: W3AC, W4AC, WR3CC, Champion: L78C, L82C