18MM Xarkaha Cunceedda Cunceedda ee Qulqulka Birta ayaa laga sameeyay bir magnetic, daboolkan inta badan waxaa loo isticmaalaa ciribtirka 18mm ee daboolka gc madaxa gc madaxa. PTFE septa wuxuu la kulmi karaa dhowr jeer.
Koofiyadaha bir ee birta u dulqaata heerkulka dhaadheer oo waxay ku habboon yihiin in lagu isticmaalo CTC \ / Leap \ / Gerstel Automamples.