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| Laum khoom yog tsim nyob rau hauv metric qhov ntau thiab tsawg los ntawm 6mm mus rau 25mm thiab nti dav li ntawm 1/4 "mus rau 1". |
 | Piv nrog rau lwm hom laum khoom, laum khoom tuaj yeem txiav txim siab ntev heev. Qhov kev xyaum luv tshaj plaws feem ntau pom yog 200 hli (8 nti) ntev. Qhov ntev tshaj plaws yog 600mm, uas yog 24 ntiv tes lossis 2 ko taw! Lawv tuaj yeem yooj yim siv los laum rau hauv phab ntsa studs, stumps lossis tuab daim ntoo. |
| Hauv av thiab cov khoom siv khov nab kuab tseem loj dua. Nruab nrab chisels ntawm hom no feem ntau yog tsawg kawg yog 150 mm (6 in) inch thiab 800 mm (31 in) ntev. |
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| Zoo li ntau lwm hom kev xyaum, cov khoom siv tho muaj nyob rau hauv "luv" daim ntawv nrog ib tug tag nrho me ntsis ntev ntawm 100-120 hli (4-4¾ nti). Cov khoom luv luv no muaj txiaj ntsig zoo rau qhov drilling qhov hauv qhov chaw nruj dua, xws li ua qhov hauv lub ru tsev kab teeb. |
