1. Base: Lub hauv paus feem ntau muab kev txhawb nqa thiab kev ruaj ntseg, kom ntseeg tau tias lub voj voog saws nyob ruaj khov thaum lub sij hawm siab - kev sib hloov ceev. Cov khoom siv thiab kev tsim cov txheej txheem ntawm lub hauv paus tseem cuam tshuam rau tag nrho cov kev ua tau zoo thiab durability ntawm cov saw hniav.
2. Cov hniav: Cov hniav yog qhov tseem ceeb ntawm cov hniav saws uas ua haujlwm txiav. Lub sharpness thiab kev npaj ntawm cov hniav txiav txim lub smoothness thiab precision ntawm txiav. Ib qhov zoo- tsim cov hniav teeb tsa txo qhov kev txiav tawm thiab txhim kho kev txiav.
3. Txheej: Lub luag haujlwm tseem ceeb ntawm txheej txheej yog txhawm rau txhim kho qhov hnav tsis kam ntawm lub voj voog saw hniav thiab txo qhov hnav ntawm cov hniav thaum siv. Qhov no tsis tsuas yog ncua kev pab cuam lub neej ntawm cov saw hniav tab sis kuj tswj kev ruaj ntseg ntawm nws cov kev ua haujlwm txiav.