This ring is designed to use the original Humbucker pickup cavity to correctly position a stratocaster styled single coil bridge pickup. The four holes used to mount the Humbucker ring is used to mount the new pickup ring. Each Strat pickup adapter is powder coated to ensure finish durability. A small amount of routing may be needed to properly position single coil pickup.  Each ring will come with four new ring mounting screws to ensure everything looks great.