Features 1、Suitable for comparative measurement of the inner diameter of the workpiece, machining measurement 2、With an excellent guiding bridge, self-centering is accurate and reliable 3、The measuring head has an active probe at one end and an interchangeable probe that is changed according to the measured aperture. 4、Made of aluminum alloy material, durable and long service life 5、High accuracy, the measuring range is 50-160mm Specification Item Type: Internal Diameter Gauge Measuring Range: 50-160mm Accuracy: 0.01mm Material: Aluminum Alloy Size: 50-160mm Measuring Range: 50-160mm Package List 1 X Internal Diameter Gauge with Handle 1 X Guard Bridge (55mm) 12 X Side Head (No.12:105mm) (No.11.:100mm) (No.10:95mm) (No.9:90mm) (No.8:85mm) (No.7 80mm) (No.6 :75mm) (No.5:70mm) (No.4:65mm) (No.3:60mm) (No.2:55mm) (No.1:50mm) 4 X Interchangeable Side Head (3 2 1 0.5) 1 Pack Installation Internal Diameter Gauge Accessories 1 X Plastic Box (the color of box is random which has black and blue)