Wooden blocks are classified by their size, which is their length from crown to tail measured round the shell; an ordinary wooden block will take a rope one-third of its size, so that a 9-inch block, for example, would be required for a 3-inch rope.
Ibloko zepali zichazwa ngokobungakanani, ngaandla ukusuka phezulu ukuya ezantsi ilinganiswa jikelele iqokobhe ukhuni oluqhelekileyo luthathe intambo kwisayizi -1/3 , ukuze i-intshi ezili-9 umzekelo ziza kufunelwa intambo ezii-intshi ezintathu