Ngā Kaihanga me ngā Kaiwhakarato o te Drill/Jack Drill - Haina Wheketere Drill/Jack Drill

Kei roto i tā mātou rārangi keri toka hau-pūmau mahi teitei ngā keri toka waewae-hau katoa: YT24, YT27, YT28, YT29A, S82, S83 me te S250, e mōhiotia whānuitia ana mō te keri toka raro whenua whai hua, te keri maina me te hanga kauhanga. Ka tukuna hoki e mātou he keri toka ringaringa maha-whakamahinga, e kapi ana i te YO18, Y19A, Y24, Y26, TY24C me te YN27C penehīni, he tino pai mō ngā wāhi whaiti me te keri ngāwari i te papa. He rite ki ngā keri toka waipēhi ngaio, ka urutau ā mātou mīhini keri toka katoa ki te pupuhi toka mārō, te keri rua, te tiaki rori me te wai. He pakari, he hua nui me te utu whai hua, ka tutuki i ā mātou keri toka keri ngā whakaritenga keri me te keri ahumahi rerekē mō ngā mahi hanga me te keri o te ao.