... 11/16"OD to 11 1/4"OD(95,120,165,172,185,197,203,216,244.....mm), ... 11/16"OD to 11 1/4"OD(95,120,165,172,185,197,203,216,244.....mm), ... which help to increase penetration rate markedly.Bosun downhole motor has independent intellectual property rights like anti-friction ... obviously improvesthe capacity of the motor and also increased the running time.Bosun downhole motor have excellent quality and ...