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The Insize Ball Tips for Gear Tooth Micrometers (Code โ 7391) are precision accessories designed specifically for use with gear tooth micrometers. These ball tips are supplied as a pair and are engineered for compatibility with 3291 and 3591 series micrometers. In addition to standard sizing, ball tip diameters ($\varnothing D$) can be customized with sizes between 1.50mm and 6.00mm.