Nyob rau hauv cov ntsiab lus, lub channel caij nplooj ntoos hlav txiv ntseej yog ib tug ntau yam, txhim khu kev qha thiab npaum fastening tov uas yog zoo tagnrho rau ntau yam kev siv. Nws cov kev tsim kho ruaj khov, yooj yim ntawm kev siv thiab kev sib raug zoo nrog ntau yam kev txhawb nqa channel ua rau nws yog qhov kev xaiv zoo tshaj plaws rau cov neeg cog lus, installers thiab cov thawj tswj haujlwm. Thaum koj xaiv lub caij nplooj ntoos hlav castellated, koj tuaj yeem ntseeg tau tias koj tab tom yuav khoom zoo uas yuav ua tau raws li koj qhov kev cia siab.