Abstract: A handheld, durable, easy-maintenance, easy-hold, precision-contour drywall finishing tool substantially in the shape of a round disk presents both convex and concave, or bull-nose, peripheral regions repectively suitable for coving, and for cleaning, flowable building material within, respectively, concave wall joints >90° and <180° nominally 135°, and convex wall joints >180° and <270° nominally 225°. The disk is preferably about 12 cm. in diameter, with its otherwise circular peripheral edge relieved over about 45° of arc in the shape of a concave curve, or bull nose, of some 3.5 cm diameter. Preferably one major surface of the disk is flat while the opposing surface slopes radially symmetrically from a central region of greater thickness, about 0.75 cm., towards a lesser thickness, about 3 mm., at the edge of the disk. A feature, preferably a knob of about 0.75 cm height by 3 cm.