Expert Quality, accurately measures bores, detect tapers or ovality. 0.01mm accuracy. Display packed in storage case. Contents: 1 x 3mm travel dial test indicator, 1 x 55mm extension bar, 4 x spacer rings size: 0.5, 1.0, 2.0 and 3.0mm, 12 x measuring rods size: 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105mm