Humbin injin kayan masarufi ne mai sauki da mai rahusa don taimakawa injin ku yana samun grab aikin. An gyara shi kuma ba zai yiwu ba. Kodayake akwai ramuka 3 akan Weld akan Dutsen don daidaita dutsen dutsen, babban yatsa ba sassauƙa azaman babban yatsa ba a matsayin babban yatsa. Weld a kan nau'in hawa shine mafi yawan zabi a kasuwa, koda mutane na ainihi yana samuwa, mutane ba su zaɓi wannan babbar hanyar babban yatsa ko kashe.