"W" Umtya usetyenziswa ngokuqhelekileyo xa inkxaso eyongezelelweyo ifunwa ngokubambisana ne-mesh kunye ne-rock bolts.Ezi ntambo zentsimbi zitsalwa kumphezulu wamatye ngeebholiti kwaye zithande ukuhambelana nomphezulu wamatye.Ikwasetyenziswa ngokubanzi kwisicelo senkxaso yomhlaba ngokukodwa kwindawo ebalulekileyo.