Cov ntsia hlau feem ntau, tseem hu ua cov ntsia hlau ib txwm lossis cov ntsia hlau du-shank, yog dav siv rau ntau yam ntoo thiab kev tsim kho. Nov yog qee qhov tseem ceeb thiab kev siv ntawm cov ntsia hlau ntau: Shank: Cov ntsia hlau feem ntau muaj qhov du, cylindrical shank yam tsis muaj twists lossis grooves. Qhov kev tsim no tso cai rau lawv kom yooj yim rau hauv cov ntaub ntawv ntoo yam tsis muaj kev sib cais lossis tawg ntawm cov ntoo.Head: Cov ntsia hlau feem ntau muaj lub taub hau tiaj tus. Lub taub hau muab thaj tsam ntawm qhov chaw kom faib lub zog tuav thiab tiv thaiv cov ntsia hlau los ntawm kev rub los ntawm cov ntoo.Sizes: Cov ntsia hlau feem ntau tuaj ntawm ntau qhov ntau thiab tsawg, xws li 2d (1 nti) txog 60d (6 ntiv tes) lossis ntev dua. Qhov loj me qhia txog qhov ntev ntawm tus ntsia thawv, nrog cov lej me me qhia rau cov ntsia hlau luv luv.Cov ntawv thov: Cov ntsia hlau feem ntau yog siv rau hauv ntau hom kev ua haujlwm ntoo thiab kev tsim kho, suav nrog framing, carpentry, kho dav dav, ua rooj tog, thiab lwm yam. Lawv tsim nyog rau kev sib txuas cov ntoo hnyav, ntoo planks, boards, thiab lwm yam khoom siv ua ke.Material: Cov ntsia hlau no feem ntau yog ua los ntawm cov hlau, uas muaj zog thiab durability.Coatings: Cov ntsia hlau feem ntau yuav muaj coatings lossis tiav rau kev tiv thaiv corrosion lossis xeb. Qee cov txheej txheem muaj xws li zinc plating lossis galvanization.Thaum xaiv cov ntsia hlau zoo ib yam rau ib txoj haujlwm tshwj xeeb, xav txog yam xws li thickness thiab hom ntoo, lub hom phiaj siv los yog lub peev xwm thauj khoom, thiab ib puag ncig uas cov ntsia hlau yuav raug nthuav tawm. Nws yog ib qho tseem ceeb uas yuav tau xaiv cov ntsia hlau ntev thiab txoj kab uas hla kom tsim nyog tuav lub zog thiab tsis txhob muaj kev puas tsuaj rau cov ntoo.