Iphinikhodi ye-elastic cylindrical, eyaziwa nangokuthi iphinikhodi yasentwasahlobo, iyikholomu engenalutho engenakhanda ene-axial slot kanye ne-chamfer emikhawulweni yomibili, esetshenziselwa ukubeka, ukuxhuma nokulungisa phakathi kwezingxenye.Kuyadingeka ukuthi ube nokunwebeka okuhle nokumelana ne-shear, futhi ububanzi bangaphandle balolu hlobo lwephini likhulu kancane kune-aperture yomhlangano.