Ama-washers wokuqeda i-Countersunk ayizigidi ezikhethekile ezenzelwe ukwamukela ikhanda lesulufu noma se-bolt, ukuvumela ukuqeda kwe-flush. Lawa ma-washer ahlukile ngenxa yokuma kwawo okuyindilinga, okwenza isibophezeli sihlale ngaphansi kunobuso bezinto, ukudala ukubukeka okubushelelezi nobuhle. Lo mklamo usizo ikakhulukazi ezinhlelweni lapho i-sleek ne-proe