Vim tias Pob Zeb isharderthan hlau uas yog vim li cas nws tsis tuaj yeem ua cov pob zeb diamond lossis carbide impregnated cov khoom.
Tshuab cuab yeej likedrillbits raug ntse los ntawm kev sib tsoo pob zeb tsis yog lwm txoj hauv kev. Nowbrickand othermasonryare brittlesothey tuaj yeem nti lossis tawg yooj yim.
