For deeper periodontal pockets5 mm or more in depth. Terminal shank redesigned to be 3 mm longer.Handle Options: #2 and #4 Handles#6 Handle: Satin Steel®Satin Steel instruments are all about comfort, control, and efficiency. The exclusive "comfort zone" is an extra-wide, gradual taper that reduces pressure points for increased comfort all day long.#7 Handle: Satin Steel® Colours®A large-diameter handle with balanced weight and soft silicone grips that provide great tactile sensitivity and rotational control. Black grips are standard.ResinEight HandleLarge, lightweight handle for comfortable grasp. Textured-wave knurl design increases rotational control. Comfort cone zone allows handle transition, which reduces pressure points. Black signature series grips with built-in color-coding capabilities.