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When designing bookcases it is useful to incorporate some adjustable shelving. Metal strips often referred to as "Tonk" strips are recognised as one of the most neat and reliable ways of achieving this. Two strips are recessed flush into each side of the bookcase and supports are used to locate the shelves at whatever height is required. At 19mm diameter these router cutters are designed to make the double groove necessary to accommodate the metal strip and fittings and they are available in 1/4" or 1/2" shank versions.