1. Dies 1/2 & 3/4 Inch (Bspt/Hss)-166007 Make/Brand- Rex Item Code - 166007 Suitable For Rex Nt50A Pipe Threading Machine. 2. Dies 1 To 2 Inch (Bspt/Hss)-16K230 Make/Brand- Rex Item Code - 16K230 Suitable For Rex Nt50A Pipe Threading Machine.