Nui nā ʻano wili i hui ʻia, ʻo ia hoʻi ʻelua wili i hui pū ʻia a me ʻekolu mau wili i hui pū ʻia (ka holoi paʻa a me ka wai puna a i ʻole ka mea holoi pālahalaha a me ka holoi puna) e like me ke ʻano o nā mea i hui pū ʻia; E like me ke ʻano o ke poʻo, hiki ke hoʻokaʻawale ʻia i loko o ka pan head hui wili, countersunk head combined screws, external hexagonal comb screws, etc; Wahi a ka mea, ua māhele ʻia i ke kila kalapona, ke kila kila a me ke kila kila (Grade 12.9).