XYT GROUP is one professional manufacturer for Spiral Steel pipe, ERW pipe, Seamless pipe, Casing pipe ... pipe, SSAW pipe. the specifications are following:* SPIRAL STEEL PIPE *OUTSIDE.D 219--3220mm W.T 6-- ... .B/X42/X52/X60/X70 X80 X100etc *ERW STEEL PIPE *OUTSIDE.D 60.3--609.6mm W. ... API 5L.B X42/X52/X60/X70 etc *CASING STEEL PIPE*OUTSIDE . D 139.7-269.9mmW.T ... ,L80Q,P110, etc API 5L GRB Spiral steel pipe