Abstract: A T-square useful for drawing lines and cutting paper or plastic sheets comprises a ruler main body of a plastic material and an auxiliary ruler section detachably and turnably connected to an end of the main body by threaded fastening members, one of the opposed surfaces of the main body and the auxiliary ruler section adjacent to where they are connected being provided with a number of retaining bores arranged in a circular pattern about the threaded connection, the other opposed surface being provided with at least one retaining projection engageable in any one of the retaining bores, whereby the angle between the ruler main body and the auxiliary ruler is adjustingly variable. A metallic edge member covers a side edge of the main body to prevent a cutting knife from bitting into the plastic material of the ruler main body.

Abstract: A cutter mat for use as a cushion or support to be laid under a sheet of paper or synthetic resin when the sheet is cut or cut off by a cutter. The mat comprises a base plate of hard synthetic resin, an intermediate layer of semihard synthetic resin and a surface layer of soft synthetic resin which are laminated to each side of the base plate. The surface layer is formed on its surface with projections or indentations to prevent slippage.