Upgraded 3-13mm Small Bore Gauge Set 1/8 Inch-1/2 Inch Telescopic Fully With Round Spherical Shaped Hardened Bore Diameter 40JEOOTDTYechs: 4 sizes of gauges are supplied in a matching case. Smooth, sensitive adjustment for better feel, for more accurate measurements. Used with an external micrometer to measure the inner diameter of holes-. Very long for setting deep and shallow holes, crevices and similar features. The Gaging surface is fully hardened to ensure a long tool life. Specifications: Material: Carbon Steel Size: 1/8"-1/5",1/5"-3/10",3/10",3/10"-2/5",2/5"-1/2"Package Included: 4x Small Hole GaugeNote: Please allow 1-3cm error due to manual measurement. Pls make sure you don't mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.