The Ultra Cuticle Nipper Half Jaw is a spring-hinged stainless steel cutting tool used to trim excess cuticle skin and hangnails during a manicure or pedicure. "Half jaw" describes the length of the cutting edge: the blade covers roughly half of the jaw opening, giving a shorter, more concentrated cutting surface than a full-jaw nipper. That shorter edge is generally easier to control in tight spots along the cuticle line and sidewalls, though it takes a smaller amount per squeeze than a full-jaw nipper covering more surface at once.
It's meant for cutting only dead, non-living tissue that has already been loosened and lifted away from the nail plate — not for trimming into skin that's still attached. The blades meet at a fine point, suited to precise work on hangnails and small areas rather than clearing a large amount of tissue in one cut.