The KOMET 4282 Dia File Set is a diamond-coated interproximal finishing system designed for use in a reciprocating contra-angle handpiece. It is primarily used for the finishing and refinement of interproximal composite restorations, allowing clinicians to smooth margins, adjust contacts, and contour proximal surfaces with high control. The set contains four one-sided diamond files in coarse, medium, fine, and extra-fine grits (DF1C, DF1, DF1F, DF1EF), enabling a controlled progression from initial shaping to final surface refinement. The single-sided diamond coating helps protect adjacent tooth structure while working interdentally, making the system both precise and conservative. Set 4282 is intended for finishing rather than bulk enamel reduction and is valued for its efficiency, tactile feedback, and ability to produce smooth, well-defined proximal surfaces.