Ọkụ na-egbuke egbuke
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Nkenke n'ime na n'èzí tube na-egbuke egbuke
Nkenke na-egbuke egbuke tube bụ ụdị elu nkenke nchara tube ihe mgbe emecha ịbịaru ma ọ bụ oyi Rolling.N'ihi na ọ dịghị oxide oyi akwa na n'ime na mpụta mgbidi nke nkenke na-egbuke egbuke tube, ọ dịghị ntapu n'okpuru elu nrụgide, elu nkenke, elu imecha, oyi ekwe na-enweghị deformation, flaring, flattening na-enweghị cracks na na, ọ bụ tumadi na-eji maka ndị mmepụta nke pneumatic ma ọ bụ hydraulic components.