stainless steel pipe use for stair railing,windows guards,Door Thickness:0 ... the nature, To the excellence. NameStainless Steel Railing StandardASTM A312, A249,A269 and A270,A554Material ... 5mmSurface180G, 240G, 320G Satin / Hairline400G, 600G Mirror finishApplicationhandrail,railing, staircase, weldmesh screen,door,window, balcony,fence,bench, ... Polishing Line Bend: stainless steel Stair railing