Sikirini
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Hexagon mutu Kudzibowola Screw mkulu mphamvu 4.8 6.8 8.8 10.9 12.9 muyezo kukula DIN7504K kudzipangira pobowola wononga wononga mtengo kupanga yogulitsa
Kupanga Tsatanetsatane Wopanga Ubwino wa YC Background YC Principle Phukusi
