open
| Material | Alloy | Diamete | Φ31.8 | Width | 600 620 640 660 680 700mm | Back S…
| Material | Alloy Butted | Diamete | Φ31.8 | Width | 600 620 660 700mm | Back S…
| Material | Steel or Alloy | Diamete | Φ25.4 Φ31.8 | Width | 560 580 600 620 64…
| Material | Steel or Alloy | Diamete | Φ25.4 | Width | 540 560 580 600 620 640m…