... CHOISE: FUDIDUO STAINLESS STEELUse for : handrail.balustrade.Windows.Doors,Railing.Heat Exchanger tube ,car engine tube ,pressure vessel tube,water transportation,decoration ... ,304,316,409,430,etc a)Round:9.5,12.7,16,17,17.5,18,19,20,22,21,25 ... ,76,89,101.6,114,133b)Square:10*10,12.7*12.7,15*15,17*17,18*18,19*19,20 ...