Cylindrical head hexagon socket head skru, 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 12.9. A na-akpọkwa skru hexagon soket, nke a na-akpọkwa bolts hexagon. Isi ya bụ isi hexagon ma ọ bụ isi cylindrical.