Muaj ntau qhov ntau thiab tsawgrebar, 8, 10, 12, uas yog hais txog nws txoj kab uas hla; 9 meters, 12 meters hais txog nws qhov ntev. Peb yuav pom cov phiaj xwm ua ke ntawm qhov chaw tsim kho, feem ntau nyias nyias, feem ntau hu ua "wire rod"; Cov hlau tuav feem ntau yog hais txog cov pob khoom uas tau txiav, thiab muaj txog ntau pua ntawm lawv hauv ib pob.