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These adapters are desgined to use Kato Unijoiner together with Peco 009/H0e flextrack.
The two small holes along the sides can be used to nail the Adapter in place or just glue it down. The Peco 009 track will rest on the platform while the head will take Kato Unijoiners. The high edge at the face end will form a sleeper in the same spacing as the Peco track has. It's possible to cover the adapter with fine ballast to hide.
These adapters are nice to make simple modul joints, to add Kato Unitrack as temporary extensions to layouts and many more uses.
This "inlay"-type is designed to be fitted into a groove/pocket at the layou-edge, while the rail is mounted directly to the ground. The pocket needs to be 4mm deep, bx 30mm long and 21mm wide. Such pockets can be created with a router, or by adding layers of 4mm plywood together.