... shaped tube, polygonal tube, single and double groove pipe and so on TypeSpecification (mm)MaterialTolerance ranges(mm) ... 63HRC1. Description: Roller and mould, welded pipe roller, stainless steel pipe mould for round/square/shaped tube.2. ... -shaped tube, polygonal tube, single and double groove pipe, tube frame, special-shaped mould, etc.5. ... not exceed ±0.05mm. High precision pipe forming mold