Nkho ea ho phunya ke sesebelisoa se thellang se fanang ka boima ba axial sebakeng se khomaretsoeng sa khoele ea ho phunya. Hangata linkho ke mokhoa oa pele oa tšireletso khahlanong le liphaephe tse khomaretsoeng 'me li ka pholosa basebetsi ho tsoa litlhaping tse bitsang chelete e ngata le ts'ebetsong ea ho lokisa ka ho "jarring" khoele ntle ho tefo.
Landrill e ka fana ka Hydraulic Drilling Jar & Double Acting Hydraulic-Mechanical Drilling Jar & Super Fishing Jar