Kunyeganyereka kwikuramo ni inkomoko ikoma amahwa nk'inkwi, kandi ni ubwoko bw'ubwubatsi.
Umucero wumurironi ni ubwoko bw'inkomoko, ariko hariho itandukaniro hagati yabo bombi. Kurugero, hariho itandukaniro muburyo bwa bibiri, inyeshyamba ni umurongo, kandi imitekerereze ni disiki. Hariho itandukaniro muri diameter ya bibiri, igituba kirageze, diameter yayo ahanini nka mm 10 kugeza 34, nuburebure muri rusange cyangwa metero 12. Diameter ya Pial Screw ahanini itarenze mm, kandi irashobora gufatwa nabi.
Ibisobanuro biratandukanye. Diameter rusange ya Pial Screw ni 6.5mm, 8.0mm, 10mm, 12mm, na 14mm, naho 14mm, mugihe diameter rusange yumunsi ni 5 kugeza 9mm.
Ibisimba bya coil mubisanzwe bikoreshwa nkibikoresho byubaka.
