- Replacement compatibility: This spark plug set is a replacement for models including 859/RCJ7Y, 863/RCJ8Y, 852/RCJ6Y, 853/CJ7Y, 848/CJ8Y, 858/CJ6Y, for 6703/BPMR7A BPM7A BPMR6A, for Bosch WSR5F 7547/WSR6F, and for stk 60 43 W22MPR-U, etc. Please check your exact model and size before ordering to ensure the correct part. - Pack and specifications: 4 spark plugs per pack. Thread size is 14 mm x 1.25 mm, thread circumference 9.5 mm, hex size 19 mm, energy value 7. - Durability and build: The electrode uses a high melting point material to extend service life. The ceramic contains a high aluminium oxide content to achieve better heat transfer and electrical insulation. The spark plug also offers excellent corrosion resistance. - Brand history: The brand has a 60-year history and has a sophisticated and complete production line. In 2005, became the largest R&D and production site for candles in China. then bought all the equipment and technical patent from DELPHI U.S.A. Candle Factory, a journey to the top of the world. - Why this matters: reliable ignition, longer life, and strong resistance to corrosion help reduce maintenance and downtime on compatible engines. - Practical use scenarios: - Replacing worn plugs on lawn and garden equipment such as mowers and tillers that use the listed RCJ/CJ style plugs. - Servicing small engines in generators, pressure washers, or other power tools that require BPMR7A/BPMR6A or WSR5F/WSR6F style plugs. - Refitting on compatible engines that match the listed models to restore smooth starting and stable performance. - Important note: Please verify your device model and thread size before purchasing to ensure compatibility with 14 mm x 1.25 mm threads and the specified 19 mm hex.