NT4R-TN6010 AKA 3607676 is a Size 4 Threading Insert for 1.25-6.25mm (4-20tpi) external and 2.0-6.25 (4-12TPI) Internal, 60 degree Widia TopThread Right hand insert
(Right hand straight on toolholders take Right hand inserts. Left Angle and Internal grooving holders take the opposite hand inserts).