Tajima's 7 in. Combination Bi-Directional Tetra-Teeth Drywall Rasp also features an in-handle dust collection design that helps capture gypsum dust during horizontal rasping and allows collected material to be emptied by holding the tool upright. The lightweight steel-and-plastic construction supports comfortable repeated use, while the side teeth provide access to corners, notches and localized areas requiring additional shaping. Designed for plasterboard and calcium silicate boards, the rasp combines coarse, fine and siderail grinding surfaces for edge preparation, material removal and finishing work, making it a practical addition to a professional drywall tool kit.