Alan

Hook / split battens

A method used to give concealed fixing in the like of cabinets and wall panelling.
They are known by various names including Hook / split battens and French cleat. I have always known this type of fixing as a hook or split batten but it as been bought to my attention that’s it’s also called a French cleat.

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Bespoke cabinet maker

And

Practical cabinetry and joinery guides for the professional and diyer alike.