The fillet (Fig. 75) is used for gilding plain lines on the backs of books. The tool is simply a small, freely revolving brass wheel mounted in an iron carriage that is fixed in a strong wooden handle. Fillets of various kinds are made; they are known as thin, thick, extra, thick, thick and thin, etc., and one, two, and three line fillets. A few examples of the lines (Figs. 76 and 77) produced by different fillets will also illustrate the manner in which the tool is employed.

The roll is also a brass wheel, similar to a fillet, but broader in the rim. Instead, however, of tracing lines, the roll reproduces any ornamental designs that have been cut upon its surface by the book binder's tool cutter.

The general form of pallets, which are of various sizes, is shown by Fig. 78. The shape of the tool suggests the manner of using it. The variety of patterns that may be cut upon pallets is infinite, from the simplest zigzag to a broad belt of flowers and leaves. Figs. 79 to 84 show simple but useful patterns.

Line tools are shaped something like pallets, but are made in sets of ten or a dozen tools of various lengths. Specimens of the lines produced by them are shown by Figs. 85 to 87.

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