GearWrench 82872N 16mm x 1.50 NF Hex Die The GearWrench 82872N 16mm x 1.50 NF Hex Die is manufactured from carbon steel for maximum durability. Made for cleaning up damaged threads, the GearWrench 82872N 16mm x 1.50 NF Hex Die features clear laser-etched markings for easy identification.