Puas yog koj lub laum pas nrig sib haum nrog cov qauv thoob ntiaj teb xov?

Yog lawm. Gdrills 'drills rods yog machined raws li thoob ntiaj teb cov qauv. Peb cov pas nrig yog sib xws nrog cov qauv thoob ntiaj teb threads.