These instruments enable efficient widening of the apical region to .06 taper, respecting the preparation performed with SC1, SC2, SU. This finishing enables an improved flow of the irrigation solution, promoting efficient disinfection and facilitated obturation. • Shaping down to the working length; more accurate finishing of the apical 1/3. • Efficient disinfection; the irrigating solution penetrates to the apical 1/3. • Optimal Cleaning. • The instruments dedicated to the apical area are tapered at .06. • Asymmetrical cross section. • The extended helical machining up to the coronal region enables a continuous bending of the instrument.