Lo mgangatho borosilicateiglasi bongisitya isilayidi ifumaneka 14mm Male okanye 19mm Ubukhulu Male.
Ezi zilayidi zemifuno zibonakalisa umqolomba obanzi wesitya, iibhastile zangaphandle zokubamba kunye nokuthintela ubushushu, kunye nepateni yemigca ejikelezayo kwiinketho zombala ezahlukeneyo.