Chips won't slow you down when creating threads to join counter-clockwise rotating parts. Left-hand threads keep components such as flywheels and propellers from loosening and spinning off. These taps force chips through the hole so there’s no buildup to damage the threads or the tap. Since you don’t need to reverse taps to extract chips, they also form threads faster than standard left-hand taps.

Three chamfer types in one set create a snug fit with left-hand fasteners that secure counter-clockwise rotating parts. Left-hand threads keep components such as flywheels and propellers from loosening and spinning off. These taps have straight flutes that are good for most jobs.