... : 2 3/8", 2 7/8", 3 1/2", 4" ,4 1/2", 5", 5 1/2" ,6 5/82.Steel grade: E75,X95,G105,S135 ... mature and advanced heat treatment to realize high strength seamless connection length guaranteed and tailored as customer request Special Feature Ⅱ Internal ... area 120~160mm long Transition area long & Smooth, the best in the world Special Feature Ⅲ Equipped with Make & Break Machine, DP ...