Ol wok bilong 'rock saw blades'

Ol 'rock saw blades' i gutpela long katim kain kain strongpela samting, olsem 'marble', 'granite', 'basalt', na 'limestone'. Tasol, ol i nidim ol spesel 'saw blade' bilong katim sampela samting, olsem daimon na 'quartz' we i gat strong bilong Mohs antap long 7.