Kōhao upoko ko hoki ngā wiri whenua poka i runga i te rau whakarewa. Ko te diameter o poka, ka taea e koe te whiriwhiri 0-20mm rahi rerekē. Ka taea e te matotoru tae 50mm.
Rotary he hoki ngongo tapahi tae atu a tawhio me tapawha engari ki te whirihoranga rerekē, me te pūmana. Ka taea e kia te diameter o Rotary i 20mm-600mm. Ka taea e te roa e taua ki length.like mīhini 3m 6m ranei.
