Very good performance three cone rotary bit, high downhole speed and long working ... to: Hejian Solidkey Petroleum Machinery Co., Ltd.,No.15, Yangguang Community, Beihuan Road, Hejian City, Hebei Province ... , to East-south Asia is always less than 15 days.3.Can I expect a quality products? ... 4”)374.6mm(14 3/4”)381mm(15”),393.7m(15 1/2”),406.4mm(16”)444.5mm ... 612,622,632,7323 cone rotary bit 4 5/8"IADC537G