They are of two types, the screwed type, which is by far the stronger of the two and in which the bolt is forced through a bored hole and held in place by a nut on its protruding end, and the driven type which is driven into the wood.
Luzindidi ezimbini, uhlobo leskrufu, eyomeleyo kunezimbini apho intsimbi inyanzelwa kumngxuma ogrunjiweyo igcinwe endaweni.