miniature brass fittings 1:Material: Brass H57-3 DZR 2:Go and No-Go checked thread with G or NPT threads 3:Brass surface ... . high quality raw bar brass material, DZR, H57-32. Go and No-Go checked thread with G or NPT threads3. brass surface ... /4"*10mm, 3/8"*10mm, 1/2"*10mm, 3/8"*15mm, 1/2"*12mm, 1/2"*15mm, 3/4"*15mm, 3/4"*22mm ...