Inqwaba yeshidi lensimbi elakheke ngokubandayo:
(1) Uhlobo: Kunezinhlobo ezimbili zenqwaba yeshidi lensimbi elingalumiyo elakheke ngendlela ebandayo (eyaziwa nangokuthi ipuleti leshaneli) kanye nenqwaba yeshidi lensimbi elakheke ngokubanda elilumayo (ihlukaniswe ngo-L, S, U, Z).
(2) Inqubo yokukhiqiza: Ukusetshenziswa kwamapuleti amancane (okuvamile asetshenziswa ukujiya 8mm ~ 14mm) endaweni ebandayo ukwakha iyunithi okuqhubekayo rolling ukwakha.