1,Material: Carbon Steel,carbon steel;Technics: Forged;Type: Coupling; 3,Can be used between ribbed bars HRB335 and HRB400 screw threaded sleeve 1.Full thread,Half thread coupling 2.Surface: galvanized, zinc,Black finishing 3.Size: 1/2"-6" 4.Samplscrew threaded sleeveScrew Threaded Sleeve With High Quality and Competitive Prices 1)- Size: 1/8"~6"2)- Thread: BSPT, DIN (ISO7/1, DIN 2999, ANSI B1.20 ...