Ngwunye ite bụ ngwá ọrụ mgbada ala nke na-ebunye ibu mmetụta axial na ebe rapaara nke eriri egwu. Igwe ọkụ na-abụkarị usoro nchebe mbụ megide ọkpọkọ rapaara ma nwee ike ịzọpụta ndị na-arụ ọrụ n'ịkụ azụ dị oke ọnụ na arụ ọrụ mmezi site na ngwa ngwa "jide" eriri ahụ n'efu.
Landrill nwere ike weta ite mmiri mmiri na-eme ihe ugboro abụọ na-arụ ọrụ hydraulic-Mechanical Drilling Jar & Super Fishing Jar