... electrical power, mine, port, building materials, chemical and other industries. The conveyor idler roller specification:1 .Roller Diameter: ... 76-219mm. 2 .Roller Length: 150mm to 3500mm . 3. Roller tube: Q235 ... the welding line , assure the roller welding 100% qualified. Roller Sealing:Our roller Sealing have 3 type , Including TK , TKII, ...