ACCURATE: With excellent guide bridge, self-centering is accurate and reliable. MEASURING RANGE: High precision, the measuring range is 50 to 160 mm. USED IN: The gauge is suitable for comparative measurement of the inner diameter of the workpiece. MODE OF USE: The measuring head has an active probe on one end and an interchangeable probe that is changed depending on the measured aperture. MATERIAL: The gauge is made of aluminum alloy material , durable and long service life. Technical specifications: Item type: inner diameter. Measuring range: 50-160 mm . Accuracy: 0.01 mm. Material: aluminum alloy. Dimensions: 50-160 mm. < p>Measuring range: 50-160 mm. Package contents: 1 inner diameter gauge with handle. 1 protective bridge (55 mm). 12 x Side Head (No. 12: 105 mm) (No. 11: 100 mm) (No. 10: 95 mm) (No. 9: 90 mm) (No. 8 : 85 mm) (No. 7: 80 mm) (No. 6: 75 mm) (No. 5: 70 mm) (No. 4: 65 mm). 55mm). .1: 50 mm) 4 x interchangeable side head (3 2 1 0.5). Accessories for inner diameter gauge for installation in pack of 1 1 x box plastic (box color is random, black). Note: This does not include other things, the color is based on the first picture and other pictures do not show as the effect Due to differences between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement. Please allow deviation. Thank you!