Material plastic, color light gray, 4.312 in. O/a lg, 0.281 in. Thk, approx 0.522 in. W, accommodates 0.087 in. Thk board, top is stamped with three rows of black letters and numbers, first row stamped 1, 2, 3, 4, 5, 6, second row and at far right side stamped e-crl, third row stamped test points