Akụkọ ụlọ ọrụ

Ihe nhazi na ojiji nke bolts na-arụ ọrụ.

Dị ka ụdị ike nke njikọ ahụ si dị, a na-ekewa ya n'ime oghere nkịtị na oghere. Dị ka udi nke isi: hexagonal isi, gburugburu isi, square isi, countersunk isi na na.

GỤKWUO

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Mr. Ma
Mr. Ma

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