7PCS High Speed ​​Steel Titanium Coated Combined Kauj ruam Laum ntsis teeb stepped laum ntsis

Lus piav qhia luv luv:

Cov txheej txheem no suav nrog ntau hom kev xyaum me ntsis qhov ntau thiab tsawg zoo tagnrho rau kev pabcuam pabcuam hauv ntau daim ntawv thov drilling.Cov laum cov khoom suav nrog cov qauv tsim rau tus kheej qhov chaw tsis muaj kev taug kev mus.Cov lus qhia kev sib cais me me muab qhov yooj yim drilling pib thiab zoo tagnrho rau ntau yam kev siv xws li ntoo, hlau, masonry thiab lwm yam.