NT3R-TN6025 AKA 3607825 is a Size 3 Top Notch Threading Insert for 1.25-4.0mm (6-20tpi) external and 2.0-5.0 (5-12 TPI) 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).