Speaking at the inquest, Chief Inspector Richard Steinborn rejected claims they were unsafe and risked the lives of innocent hostages by colliding with walls and fragmenting.
Hostages Katrina Dawson and Tori Johnson were killed when gunman Man Haron Monis stormed the Lindt cafe in Sydney in 2014.
The gunman was also killed.
SBS Reporter Alyshia Gates was at the inquest today and she's speaking here to Peggy Giakoumelos.