Material:S For bearin 6310 6312 For Pipe:Up to 219 mm Thickness:2.5~6 mm For Shaft:17~50 mm Outer Diameter:Up to 219 mm Hole Diameter:20~94 mm Bore Diameter:40~130 mm Name:Steel Idler Roller Bearing Housing Material:S steel Appropriate bearings:Deep Groove Ball Bearing