I-drill kagesi Izicaciso eziyinhloko 4, 6, 8, 10, 13, 16, 19, 23, 25, 32, 38, 49mm, njll. inombolo ibhekisela kububanzi obukhulu bebhithi lokubhoboza elibhojwe ensimbi enamandla aqinile. kwe 390n / mm.Okwezinsimbi ezingenayo insimbi, amapulasitiki nezinye izinto, ama...
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