Description Those gages are used with an outside micrometer for measuring inside diameter of bores and are extra long for gaging deep and shallow holes, slots and similar workpieces. The gaging surface of each piece is fully hardened to insure long tool life. Feature - Color: As shown - Material: metal - Size: 10.5 x 1 x 1cm - Used with an outside micrometer for measuring inside diameter of bores. - Extra long for gaging deep and shallow holes, slots and similar work pieces. - Gaging surface is fully hardened to insure long tool life. - 4 sizes of gages are supplied in a fitted case. - Spherical measuring faces hardened, Tool adjustment shaft Satin finishPackage list: 4 Pcs x Full-Ball Small Bore Hole Precision Gage Gauge Set Telescoping Full Round Spherical Shaped Hardened Bore Gauge 3 to 14mm