2011-01-06 company new name-" Tianhe Oil Group Huifeng Petroleum Equipment Co., Ltd."

2010-09-03 small size hole openers has been designed !, 7 5/8" & 8 1/2" size

2010-9-03 thread gauges from USA!
2 3/8", 2 7/8", 3 1/2" PAC;  6 5/8", 7 5/8", 8 5/8" 4 1/2", 3 1/2"H90; HT55, XT57 ( 181mm OD); 1"AMMT