Model:DTH drill pipes outer diameter:76mm, 89mm, 102mm, 114mm; DTH drill pipes thread sizes:2 3/8" API Reg, 2 7/8" API Reg, 3 1/2" API Reg, 4 1/2" API Reg, 2 3/8" API IF, 3 1/2" API IF; DTH drill pipes length: 1000mm, 1500mm, 2000mm, 30000mm, 6000mm.