A wood or metal disk, having a groove around its cylindrical surface to permit a rope or chain to run over it without slipping off and a bushing for bearing on the pin or bolt on which it revolves.
Umthi okanye isinyithi esisicaba esinemingxunya embhobheni, ethi ivumele intambo okanye ityathanga lijikeleze ukuze lingawi nesinyithi esibambe isikhonkwane okanye intsimbi apho lijikeleza khona..