Interchangeable Anvils for Mitutoyo Screw Thread Micrometers 60° Threads For use with Mitutoyo 326 & 126 Series Screw Thread Micrometers Set includes the following pitch anvils... 64-48 TPI / 0.4-0.5 mm 44-28 TPI / 0.6-0.9 mm 24-14 TPI / 1-1.75 mm 13-9 TPI / 2-3 mm 8-5 TPI / 3.5-5 mm 4.5-3.5 TPI / 5.5-7 mm