Insize Gear Tooth Micrometer 0 2" Range Series 3291 2 Insize Digital Caliper 0 1000mm 0 40" Range Series 1131 40 To know what size the 2MT TO 3JT DRILL CHUCK ARBOR HARDENED MT2 JT3 JACOBS MORSE TAPER SHANK Jacobs Taper To know what size the insert should be it refers to the last two digits in the code DWLNL2020K08 meaning a WN 08 insert burr free holes with minimal resistance and reduced cutting force✔ Long Lasting Performance: Tungsten carbide ensures the cutter maintains sharpness even in demanding applications✔ Ideal for Heavy Duty Use: Perfect for industrial applications that require deep and precise hole cutting✔ Versatile: Works with most standard drill chucks The Insize Gear Tooth Micrometer is a precision tool specially designed for measuring the thickness of gear teeth Well designed