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The SNAP ON S9721 & S9726 Universal Double Swivel Spark Plug Sockets are a set of two impact sockets designed with 6-point drive type and 3/8" drive size. These sockets feature a universal double swivel design for easy installation and removal of spark plugs. Made in the United States by the trusted brand Snap-on. Has the initial "BL" on them, I pointed to that in the pictures.
