| Model | Opening Size/mm | Applicable Material |
| W-20 | Thickness of specimen 0.6-6mm inner diameter﹥10mm | General aluminum and aluminum alloy profile |
| W-20a | Thickness of specimen 0.6-13mm inner diameter﹥10mm | Aluminum and aluminum profile with thickness less than 13mm |
| W-20b | Thickness of specimen 0.6-8mm inner diameter﹥6mm | Aluminum pipes with inner diameter more than 6mm |
| W-B75 | Thickness of specimen 0.6-6mm inner diameter﹥10mm | Brass pipes and brass belts |
| W-B75b | Thickness of specimen 0.6-8mm inner diameter﹥6mm | Thin brass pipes and brass belts |
| W-BB75 | Thickness of specimen 0.6-6mm inner diameter﹥10mm | Copper pipes and copper belts |
| W-BB75b | Thickness of specimen 0.6-8mm inner diameter﹥6mm | Thin copper pipes and copper belts |
| W-B92 | Thickness of specimen 0.6-6mm inner diameter﹥10mm | Soft stainless steel, cold rolled steel |