1.size:1/4-6" 2.hot dipped galvanized,electric galvanized,bake galvanized,black heavy type,light type 3.BS,DIN,NPT ... are of rich assortments:banded,beaded,and plain;galvanized and black;with ribs and without ribs;heavy and light...Material: ... ironSize:1/4-6inchSurface:Hot dipped galvanized,electric dipped galvanized,bake galvanized,black;with ribs and without ribs.Standard:BS standard, ...