curved, smooth, 16.0 mm jaws, 13" (33.0 cm) Iowa Membrane Puncturing Forceps are commonly used to rupture the membrane surrounding the amniotic fluid and induce labor in a pregnant woman. The s-shaped forceps feature long, slender hooks with 5X6 teeth to puncture the membrane. The ring handles allow the obstetrician to perform the procedure comfortably and with ease.