1. Aha Cylindrical head hexagon socket head screws, nke a na-akpọkwa isi hexagon socket bolts, cup head skru, na hexagon socket skru, nwere aha dị iche iche, mana ha pụtara otu ihe. Ihe mkpuchi isi oghere hexagon a na-ejikarị gụnyere ọkwa 4.8, ọkwa 8.8, ọkwa 10.9, na ọkwa 12 ...
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